NOVELTY - Producing Bacillus amyloliquefaciens biocontrol agents, comprises carrying out citric acid pretreatment of waste water and then sterilizing, equipping pretreated wastewater with citric acid in triangular flask and then shaking and inoculating Bacillus amyloliquefaciens, adding the liquid seed in a fermentation medium and then inoculating, culturing and fermenting, weighing biochar and fermentation liquid, adding the fermentation liquid to the biological carbon and then mixing to obtain a solid microbial inoculum and then drying.    USE - The method is useful for producing Bacillus amyloliquefaciens biocontrol agents, which are useful for producing a soil base fertilizer (all claimed) for preventing and treating plant fungal disease and promoting the growth of plant.    ADVANTAGE - The method is capable of simply, economically and eco-friendly producing the Bacillus amyloliquefaciens biocontrol agent, which improves quality and yield of vegetables.    DETAILED DESCRIPTION - Producing Bacillus amyloliquefaciens biocontrol agents, comprises (a) carrying out citric acid pretreatment of waste water by adjusting pH value of biomass power plant ash to 7-8 using potassium carbonate and sterilizing at 110-121 degrees C for 10-30 minutes, (b) equipping pretreated wastewater with citric acid in a triangular flask and then shaking at speed of 120-200 revolutions per minute (rpm) and inoculating Bacillus amyloliquefaciens at 25-37 degrees C for 24-36 hours to obtain seed liquid, (c) adding the 2-15% of seed liquid in a fermentation medium at 25-37 degrees C for 15-36 hours and then inoculating, culturing by flat bacteria and fermenting to obtain fermentation liquid, and (d) weighing biochar and fermentation liquid in a ratio of 1:1.5-1:5, adding the fermentation liquid to the biological carbon and then uniformly mixing to obtain a solid microbial inoculum and then drying until water content is 30%, packing and storing. An INDEPENDENT CLAIM is included for use of Bacillus amyloliquefaciens biocontrol agent for producing a soil base fertilizer, where the application method comprises diluting the fermented liquid or solid microbial inoculum with water until a viable cell count is 2x 106-5x 107 colony-forming unit (CFU)/ml and then mixing and filtering, adding organic fertilizer with Bacillus amyloliquefaciens having viable cell count of 2x 106-1x 108 CFU/ml.