NOVELTY - Forming organic matter decomposing inoculant involves selecting strain from combination of Bacillus subtilis, Bacillus licheniformis, Trichoderma koningii and Phanerochete chrysosporium, Bacillus laterosporus, Sporosarcina psychropilus and Clostridium thermocellum; forming seed liquid, forming first-stage and second level seed liquid by adding the first-stage seed liquid, inoculating and adjusting viable count of target strain, forming fermentation seed liquid, mixing, inoculating material, composting metering and packaging.    USE - For the preparation of organic matter decomposing inoculant (claimed).    ADVANTAGE - The method has low production cost, has simple technique, is convenient to use, has improved application effect, and is good for popularization and application.    DETAILED DESCRIPTION - Preparation of organic matter decomposing inoculant involves selecting strain from combination of Bacillus subtilis, Bacillus licheniformis, Trichoderma koningii and Phanerochete chrysosporium, Bacillus laterosporus, Sporosarcina psychropilus and Clostridium thermocellum and identifying strain biology safety by using microorganism fertilizer biology safety general technology, and using toxically safe strains; forming seed liquid by culturing strain combination in inclined plane culture medium, diluting inclined plane strain culture medium by 5-10 ml sterile water in a bottle, inoculating the inclined plane culture medium in the following culture conditions: culture temperature is 25 to 50 degrees C, culture time is 24 to 96 hours to form seed liquid, forming first-stage seed liquid by flushing in a bottle the inclined plane culture strain liquid with sterile water to form uniform suspension, regulating viable count of each bacteria to 10 to 120 hundred million cfu/ml and viable count of fungi to 0.5 to 3 hundred million cfu/ml; storing in a sterile steel container, forming second level seed liquid by adding the first-stage seed liquid, inoculating to 121 degrees C for 120 minutes in special solid culture medium in a single a strain fermentation vessel, inoculating for 2-7 days using flat plate counting method to determine viable count with sterile water and adjusting the viable count of target strain, forming uniform suspension of single strain to form second level seed liquid, forming fermentation seed liquid by taking second level seed liquid of each strain according to different strain combinations, forming fermentation seed liquid according to any weight, where total number of the ferment active in seed liquid is 5-20 billion/ml, adding fermentation culture medium, where fermentation culture medium comprise following raw materials: 30 to 35 wt.% of sawdust, 10 to 20 wt.% straw powder, 15 to 25 wt.% rice, 20 to 25 wt.% bran, 0.5 to 1 wt.% cane sugar, 3 to 5 wt.% ammonium sulfate, 0.3 to 0.5 wt.% dipotassium hydrogen phosphate, 0.1 to 0.3 wt.% magnesium sulfate, and water with neutral pH value, where weight ratio is 1:1 to 4:1, mixing initial culture medium and the fermentation culture medium according to the proportion uniformly, directly spraying fermentation seed liquid to stacking surface; uniformly mixing fermentation seed liquid and fermenting culture medium, inoculating a material into fermentation vessel, composting product, drying, pulverizing, metering and packaging, stack drying at temperature of 40 degrees C to 60 degrees C and maintaining water content at 6 to 10%, smashing material stack, passing through 2 mm mesh sieve, and keeping for further use, where the valid viable count is 2.3 to 23 hundred million/g, cellulase activity is 300 to 1000 U/g, protein enzyme activity is 35-200 U/g, water content is 2 to 30%, pH is 5.5 to 7.5, fineness is 70 to 100 wt.%, and packaging to form organic matter-decomposing inoculant.