NOVELTY - Method for preparing pleuromutilin bacterial harmless residue processing biological fertilizer, involves processing pleuromutilin bacterial harmless residue, preparing sterilized eggplant bottle and Streptomyces microflavus freezing tube, preparing shake flask liquid seed culture and sterilized triangular flask, culturing by inoculating, performing shake culture, performing fermentation tank culture, adding 40 kg calcium carbonate, sterilizing, inoculating, stirring, fermenting, reducing sugar and placing into the container.    USE - The method is useful for preparing pleuromutilin bacterial harmless residue processing biological fertilizer (claimed).    DETAILED DESCRIPTION - Method for preparing pleuromutilin bacterial harmless residue processing biological fertilizer, involves processing pleuromutilin bacterial harmless residue by adding the 41.62% residue and 0.236% bacteria in 1000 ml reaction tank, adding 400 ml 1.7% ammonia water, stirring uniformly, soaking for 2 hours, heating at 95 degrees C, naturally cooling, and using hydrogen chloride to adjust the pH to 9, taking 200 g potato, cutting into small blocks, adding 400 ml water, boiling and filtering, adding 20 g glucose, 20 g agar and 1000 ml distilled water, then putting them into 250 ml eggplant bottle, filling to 50 ml, and sterilizing at 121-124 degrees C for 30-40 minutes, taking sterilized eggplant bottle and Streptomyces microflavus freezing tube without bacteria and purifying worktable, putting at constant temperature of 28 plus minus 1 degrees C and culturing for 5-7 days, preparing shake flask liquid seed culture by adding corn starch, glucose, peptone, ammonium sulfate, magnesium sulfate and dipotassium phosphate into the material preparing bucket, adding distilled water, stirring, using sodium hydroxide solution to adjust pH to 7.8, adding 20 g calcium carbonate, stirring uniformly, placing in a triangular flask, each bottle filling 200 ml, and sterilizing, taking sterilized triangular flask and culture-cultivate the eggplant bottle seeds into sterile purified working bench, where each eggplant bottle with 5 triangular flask, putting into rotary shaking oscillation culture, performing fermentation tank culture by adding tap water, corn starch, glucose, ammonium sulfate, magnesium sulfate, heating, controlling pH, then adding 40 kg calcium carbonate, sterilizing at 118-122 degrees C, cooling to 28-30 degrees C, inoculating, stirring, fermenting by culturing at 28-30 degrees C for 40-48 hours, reducing sugar to less than 0.2%, and placing into the container.