NOVELTY - Biologically preparing organic and inorganic compound liquid fertilizer, by (a) mixing effective microorganism (EM) fermented feed:chicken manure:1% EM stock solution, fermenting mixture, and drying fermented product, (b) mixing fermented product and EM active liquid, adding mixture to fermenting tank, and fermenting mixture, (c) filtering obtained fermentation liquid to obtain clear liquid, (d) mixing nutrients chosen from nitrogen, phosphorus pentoxide and potassium oxide with filtered liquid, and (e) storing and bottling the liquid to obtain fertilizer.    USE - The method is useful for biologically preparing organic and inorganic compound liquid fertilizer (claimed), where the fertilizer is useful for improving crop yield and growth of crop.    ADVANTAGE - The method is rapidly ferments materials, consumes less time, and prepares fertilizer that provides all essential nutrients to crop.    DETAILED DESCRIPTION - Method for biologically preparing organic and inorganic compound liquid fertilizer, involves (a) performing solid fermentation by mixing effective microorganism (EM) fermented feed: chicken manure: 1% EM stock solution in a weight ratio of 5-8:88-92:3-4 (parts by weight), fermenting mixture at room temperature for 21-25 days, and drying fermented product until the moisture content reaches less than or equal to 30 wt.%, (b) mixing fermented product and EM active liquid in a weight ratio of 1:9, where the fermentation is anaerobic fermentation, adding the mixture to fermenting tank, where the fermentation is performed under the condition of stirring in a batch, and sealing and fermenting mixture for 5-7 days to obtain fermentation liquid, (c) filtering the obtained fermentation liquid to remove insoluble substance to obtain clear liquid, where the filtering step is performed by 100 meshes filter screen, and storing filtered liquid, (d) adding and mixing nutrients chosen from nitrogen, phosphorus pentoxide and potassium oxide with the filtered liquid until the content ratio of nitrogen, phosphorus pentoxide and potassium oxide reaches 1:2:2.5, where the sum of content of nitrogen, phosphorus pentoxide and potassium oxide is greater than or equal to 110g/l, and (e) storing the liquid and bottling the liquid to obtain fertilizer.