NOVELTY - Method for producing organic liquid fertilizer through biogas slurry, involves adding the biogas slurry and precipitating mud, sand and solid object, pumping precipitated biogas slurry, performing aeration fermentation, radically killing harmful bacteria, extracting fermented biogas slurry, filling the biogas slurry in the humic acid reaction kettle, adding nitrogen, phosphorus, potassium and other microelements, and uniformly stirring and heating the substance, and storing prepared organic liquid fertilizer, and conveying and packing the finished product.    USE - The method is useful for producing organic liquid fertilizer through biogas slurry.    ADVANTAGE - The method enables to produce organic liquid fertilizer having high nutritional value and is suitable to large scale production.    DETAILED DESCRIPTION - Method for producing organic liquid fertilizer through biogas slurry, involves (a) adding the biogas slurry in a precipitation pool to precipitate for 24 hours, precipitating mud, sand and solid object in the pool bottom, removing paper, plastic bag and other floating object to prevent blocking of liquid absorption pump, (b) pumping the precipitated biogas slurry to aeration fermentation pool through liquid absorption pump, where the amount of added precipitated biogas slurry is 60-70% of the aeration fermentation pool volume, then adding corrosion agent (2.5 g) in each ton of precipitated biogas slurry with respect to added precipitated biogas slurry, performing aeration fermentation for 48 hours, during aeration further rotting the biogas slurry, and radically killing harmful bacteria in the biogas slurry to obtain fermented biogas slurry, (c) extracting the fermented biogas slurry using solid liquid separation device from the aeration fermentation pool, performing solid liquid separation using 120-160 meshes sieve of the solid liquid separation device to make separation fineness achieves the technique requirement of spraying the liquid on the plane leaf face and prevent blocking of nozzle of agroatomizer, flowing the biogas slurry to the separation liquid gathering pool, and entering solid object to the solid object gathering vehicle, (d) filling the biogas slurry in the humic acid reaction kettle after extracting the separated biogas slurry from the separation liquid gathering pool, where the amount of added humic acid reaction kettle volume is 60% with respect to amount of added separated biogas slurry in the humic acid reaction kettle, adding the humic acid with respect to humic acid (120 g) in each ton of the separated biogas slurry, and adding sodium hydroxide solid with respect to added sodium hydroxide solid (12 kg) in each ton of separated biogas slurry reacting the humic acid with the biogas slurry to form the humic acid reaction substance, (e) adding the humic acid in the humic acid reaction liquid sedimentation pool and precipitating for 48 hours, (f) obtaining supernatant from the humic acid reaction liquid sedimentation pool, adding nitrogen, phosphorus, potassium and other microelement with respect to needed nutrition of the different crop growth, and uniformly stirring and heating the substance at 40 degrees C to obtain organic liquid fertilizer finished product, (g) storing the prepared organic liquid fertilizer in storage tank, and (h) conveying the organic liquid fertilizer finished product in the finished product storage tank to canning machine and packaging the product. An INDEPENDENT CLAIM is included for device, which comprises primary material pipeline, precipitation pool, precipitation material liquid absorption pipe, fan, fan pipeline, aeration fermentation pool, aeration device, fermentation material liquid absorption pipe, solid liquid separation device, separation liquid gathering pool, clean liquid conveying pipeline, humic acid reaction kettle, humic acid reaction liquid conveying pipeline, humic acid reaction liquid precipitation pool, precipitated humic acid reaction liquid conveying pipeline, compounding complexing reaction kettle, finished product conveying pipeline I, finished product storage tank, finished product conveying pipeline II, canning machine, canning pipeline, several liquid absorption pumps and several pipeline valves, where the precipitation pool, the aeration fermentation pool and the separation liquid gathering pool are mounted under the ground, the humic acid reaction liquid precipitation pool is mounted on the ground, the solid liquid separation device is mounted above the separation liquid gathering pool, the precipitation pool, the aeration fermentation pool, the separation liquid gathering pool and the humic acid reaction liquid precipitation pool are internally provided with the liquid absorption pump, the primary material pipeline with the pipeline valve is led out from the inner of the precipitation pool and extended to the biogas slurry storage pool, an end of the precipitation material liquid absorption pipe with the pipeline valve is connected with the liquid absorption pump in the precipitation pool, the other end of the precipitation material liquid absorption pipe is extended to the aeration fermentation pool, an end of the fan pipeline with the pipeline valve is connected with the air outlet of the fan, the other end of the fan pipeline is connected with the air inlet of the aeration device in aeration fermentation pool, an end of the fermentation material liquid absorption pipe with the pipeline valve is connected with the liquid absorption pipe in the aeration fermentation pool, the other end of the fermentation material liquid absorption pipe is extended to the solid liquid separation device, the liquid absorption pipe placed in the separation liquid gathering pool is connected with the upper part of the humic acid reaction kettle through the clean liquid conveying pipeline and the pipeline valve, the lower part of the humic acid reaction kettle is connected with the humic acid reaction liquid precipitation pool through the humic acid reaction liquid conveying pipeline and the pipeline valve, the liquid absorption pump in the humic acid reaction liquid precipitation pool is connected with the upper part of the compounding complexing reaction kettle through the precipitated humic acid reaction liquid conveying pipeline and the pipeline valve, the lower part of the compounding complexing reaction kettle is connected with the middle upper part of the finished product storage tank through the finished product conveying pipeline I, two pipeline valves at two ends of the finished product conveying pipeline I and the liquid absorption pump mounted at the middle part of the finished product conveying pipeline I, the lower part of the finished product storage tank is connected with the input opening of the canning machine through the finished product conveying pipeline II and the pipeline valve, the output opening of the canning machine is connected with the canning pipeline, and the canning pipeline is extended to a color bag.