NOVELTY - A bio-organic fertilizer producing method involves preparing biogas liquid for obtaining ferment culture medium. A single colony of an inclined plane strain is inoculated into a bottle filled with sabouraud dextrose agar with yeast extract (SDAY) culture medium for obtaining a primary seed liquid and a secondary seed liquid. The ferment culture medium is added into a ferment tank. An antifoaming agent is inoculated into the cultured secondary seed liquid to obtain a third seed liquid. The antifoaming agent is inoculated into the third seed liquid for obtaining the fertilizer.    USE - Method for producing a bio-organic fertilizer that is utilized to control soil-borne disease of economic crops such as tomato and cotton.    ADVANTAGE - The method enables utilizing the ferment product of Xinjiang biogas as basic culture medium, and obtaining the organic fertilizer with reduced production cost for promoting growth of economic crops.    DETAILED DESCRIPTION - A bio-organic fertilizer producing method involves preparing 1000 ml of biogas liquid with the contents containing (in g) corn powder (10-15), bean pulp (10-25), potassium dihydrogen phosphate (12), calcium carbonate (15-20), magnesium sulfate (0-5), ammonium sulfate (1-2), glycin (0-5), sodium chloride (1.5-2.5) and potassium nitrate (2-4) for obtaining ferment culture medium. The obtained ferment culture medium is sterilized. Bacillus subtilis is put on a sodium nutrient agar culture medium test tube inclined face. Culturing process is performed in a culture box at 28-30 degrees C for 16-24 hours for obtaining an inclined plane strain. A single colony of the inclined strain is selected by an inoculating ring and inoculated into a triangular bottle filled with SDAY culture medium, where liquid filling amount of the SDAY culture medium is 20-50% of the volume of the triangular bottle. The triangular bottle is oscillated at 28-30 degrees C at 180-200 r/min for 16-24 hours for obtaining primary seed liquid. The primary seed liquid is inoculated into a triangular flask filled with the SDAY culture medium, where inoculating amount of the SDAY culture medium is 3-5% (v/v), and liquid filling amount of the SDAY culture medium is 20-50% of the volume of the triangular flask. The triangular flask is shook to culture at 28-30 degrees C at 180-200 r/min for 16-24 hours for obtaining secondary seed liquid. The ferment culture medium is added into a stirring-type ferment tank, where the liquid filling amount of the ferment culture medium is 50-60% of the volume of the ferment tank. 0.09-0.11% (w/v) of an antifoaming agent is inoculated into the cultured secondary seed liquid according to inoculating amount of 5-10%. The culturing process is carried out at 60-80 kPa at 180-200 r/min for 16-24 hours for obtaining third seed liquid. The ferment culture medium is added into the stirring-type ferment tank, where the liquid filling amount of the ferment culture medium is 50-60%. 0.09-0.11% (w/v) of the antifoaming agent is inoculated into the third seed liquid for fermenting at 28-30 degrees C with lower ventilation volume of 8-10 L/min at tank pressure of 60-80 kPa and at stirring speed of 180-220 r/min condition. The liquid is fermented for 50-72 hours for obtaining the bio-organic fertilizer.