NOVELTY - Fully automated biogas production purifying device comprises a fecal filter (13), an aerobic digester (14), a biogas digester (15), and a microbial reactor. The microbial reactor comprises a liquid inlet pipe (1) and its control pump (19), a liquid outlet pipe, an air inlet pipe and its control pump, an air outlet pipe, a nutrient solution supplement pipe and its control pump, a strain supplementary pipe and its control pump and a group of vertical opaque pipes arranged at intervals with transparent pipes. The opaque pipes are provided with a heating device.    USE - Used as fully automated biogas production purifying device.    ADVANTAGE - The device: is simple in structure, economical, convenient to manufacture, adapted for recycling agricultural wastes; and has a low carbon economy.    DETAILED DESCRIPTION - Fully automated biogas production purifying device comprises a fecal filter (13), an aerobic digester (14), a biogas digester (15), and a microbial reactor. The microbial reactor comprises a liquid inlet pipe (1) and its control pump (19), a liquid outlet pipe, an air inlet pipe and its control pump, an air outlet pipe, a nutrient solution supplement pipe and its control pump, a strain supplementary pipe and its control pump and a group of vertical opaque pipes arranged at intervals with transparent pipes. The opaque pipes are provided with a heating device. The fecal filter and the aerobic digester are located in the biogas digester. The fecal filter is connected to the aerobic digester through its side wall by a connecting pipe. A pump is connected between the aerobic digester and the biogas digester through a pipeline connection. The biogas digester is provided with air and liquid outlets. The microbial reactor with a liquid outlet pipe has a bypass water pump and is connected to the bottom of the aerobic digester by a pipe. The air liquid and air inlet pipes of the microbial reactor and the control pump are connected to the biogas digester. The nutrient solution supplementing pipe and its control pump, the strain supplementary pipeline and its control pump are arranged on the biogas digester. The liquid outlet and the liquid inlet pipes and its control pump are connected to the microbial reactor between the liquid inlet pipes. The liquid inlet pipe and air outlet pipe of the microbial reactor are arranged in parallel, above the microbial reactor. The liquid outlet pipe and the air inlet pipe are arranged in parallel to the bottom of the microbial reactor. The liquid inlet pipe is parallel to the liquid outlet pipe, in between the group of vertical opaque pipes arranged at intervals with transparent pipes. The opaque pipe with the horizontal liquid inlet pipe and liquid outlet pipe are connected through a detachable sealing ring. The vertical transparent pipe with the liquid inlet pipe and liquid outlet pipe are directly connected by a pipeline joint with waterproof glue sealing. The level between the liquid inlet pipeline and air outlet pipeline is more than one vertical pipe. The air inlet pipe and the liquid outlet pipe are located below the transparent pipeline and the liquid outlet pipeline is connected with the air inlet pipeline by more than one vertical pipeline. The microbial reactor, installed in different positions equipped with different sensor probes, comprises a microbial reactor on a transparent pipeline with a pH sensor, a temperature sensor, an air outlet pipes, a carbon dioxide partial pressure sensor, and these sensors detect the signal input to the computer. The sensor parameters obtained by program processing direct the control of air inlet pipeline pump, liquid inlet pipeline pump, nutrient solution supplementing pipeline pump, strain supplementary pipeline pump and turning on or off the heating device. An INDEPENDENT CLAIM is also included for purifying biogas, comprising e.g.: (i) paving treated straw directly on the fecal filter at a thickness of 5-10 cm, forming a straw-fecal filtration layer for filtering livestock manure and cleaning sewage, where the processed cleaned straw is rice or wheat straw, crushing into small sections of 10 cm, soaking in Citrus tomentosa or lime water prepared, for 2-4 hours to soften, removing the moisture content to dry, (ii) discharging livestock manure and fecal sewage together into the fecal filter through the straw fecal filtration layer, large amount of fecal matter as residue at the straw filtering layer, collecting the fecal filtrate and sewage through a pipeline and passed into the aerobic digester, allowing to stand for 6-8 hours, transferring into the biogas digester through a pump and (iii) through the liquid outlet pipeline of the microbial reactor, connecting with the bypass pipeline, pumping the fluid containing a large amount of mixture of strains to the aerobic digester, adding the fecal filtrate and the sewage water mixture to the aerobic digester in a mixing volume ratio of 1:10-20, mixing for 6-8 hours, pumping the fecal filtrate into the biogas digester for anaerobic fermentation to generate biogas.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of the fully automated biogas production purifying device.    Liquid inlet pipe (1)    Fecal filter (13)    Aerobic digester (14)    Biogas digester (15)    Control pump (19)