NOVELTY - A microorganism fertilizer comprises Bacillus amyloliquefaciens, Bacillus thuringiensis, Bacillus subtilis, lactic acid bacteria, substrate fermenting agent, corn straw, grass carbon, fly ash, mushroom residue, swelling pig manure, methyl synergistic phosphorus powder, synergistic ether powder, ethylene, urea, diammonium phosphate, potassium sulfate, radix sophorae flavescentis, golden larch bark, pepper, ginkgo skin, common cnidium fruit, cortex meliae, quisqualis, Chinese gall, pubescent holly root, soapberry peel, fructus ulmi, camphor and semen momordicae.    USE - Microorganism fertilizer for preventing celery soft rot.    ADVANTAGE - The fertilizer improves yield, quality and soil condition and increases probiotics in soil, and is pollution-free and low in residue.    DETAILED DESCRIPTION - A microorganism fertilizer comprises 0.8-1 pts. wt. bacillus amyloliquefaciens, 0.6-0.8 pts. wt. bacillus thuringiensis, 0.5-0.7 pts. wt. bacillus subtilis, 0.4-0.8 pts. wt. lactic acid bacteria, 1-3 pts. wt. substrate fermenting agent, 30-35 pts. wt. corn straw, 20-30 pts. wt. grass carbon, 30-36 pts. wt. fly ash, 10-20 pts. wt. mushroom residue, 30-40 pts. wt. swelling pig manure, 2-4 pts. wt. methyl synergistic phosphorus powder, 1-3 pts. wt. synergistic ether powder, 0.4-0.6 pts. wt. ethylene, 12-16 pts. wt. urea, 10-12 pts. wt. diammonium phosphate, 6-8 pts. wt. potassium sulfate, 5-10 pts. wt. radix sophorae flavescentis, 10-15 pts. wt. golden larch bark, 20-30 pts. wt. pepper, 20-30 pts. wt. ginkgo skin, 20-30 pts. wt. common cnidium fruit, 10-30 pts. wt. cortex meliae, 15-25 pts. wt. quisqualis, 1-15 pts. wt. Chinese gall, 5-15 pts. wt. pubescent holly root, 55-60 pts. wt. soapberry peel, 10-15 pts. wt. fructus ulmi, 5-15 pts. wt. camphor and 5-15 pts. wt. semen momordicae. An INDEPENDENT CLAIM is also included for a method for preparing microorganism fertilizer, which involves inoculating Bacillus amyloliquefaciens, Bacillus thuringiensis, Bacillus subtilis, and lactic acid bacteria in a medium under fermentation conditions, where the final volume of each bacteria is 6X 109 cells/ml, followed by mixing substrate fermenting agent, performing fermentation for 1 day at a temperature below 50 degrees C, 6-8 days of fermentation is complete, where the content of microbial inoculum is greater than or equal to 5X109 cells/ g, adding fermentation agent to a mixture of corn straw, peat, fly ash, slag mushroom, turning mechanically at a time interval of 1-2 days, controlling the temperature so that white hypha is generated, where the solid state fermentation temperature does not exceeding 60 degrees C, moisture content of the fermented product is 35-40%, mixing fermented mixtures, followed by cooking for 2-3 days, turning for 2-4 times, heating at a temperature lesser than 60 degrees C so that the water content is less than 30%, mixing ethylene, urea, diammonium phosphate, potassium sulfate, radix sophorae flavescentis, golden larch bark, pepper, ginkgo skin, common cnidium fruit, cortex meliae, quisqualis, Chinese gall, pubescent holly root, soapberry peel, fructus ulmi, camphor and semen momordicae, drying in a fluidized bed, controlling temperature at 90 degrees C, where the water content is controlled at 10-15%, followed by crushing and sieving to 80 mesh fineness, spraying steam in a feed roller conveyor so that the material is heated to 50-60 degrees C, followed by passing into drying drum, hot air drying, cooling, screening, and canning.