NOVELTY - Method for preparing organic material decomposing microbial inoculum, involves culturing slant culture of white Trichoderma and Bacillus subtilis through a multistage culture method using solid culture medium and then using liquid culture medium, to obtain white Trichoderma and B.subtilis liquids, and adding 20-30% white Trichoderma liquid, 10-15% B.subtilis liquid and 1-2% sodium carbonate to animal manure, and performing aerobic and anaerobic fermentation to obtain product.    USE - The method is useful for preparing an organic material decomposing microbial inoculum (claimed).    ADVANTAGE - The method enables to decompose macromolecule protein and carbohydrate in the waste and the straw into micromolecule substances, dissociates elements e.g. phosphorus and potassium and separates micro metal element which are absorbed and utilized by a plant rapidly, and prepares material which is environmentally-friendly.    DETAILED DESCRIPTION - Method for preparing organic material decomposing microbial inoculum, involves (a) culturing slant culture of white Trichoderma in a solid culture medium at 28-30 degrees C for 3 days to obtain a white Trichoderma seed inoculum, inoculating and culturing seed inoculum in the solid culture medium at 28-30 degrees C for 3-5 days to obtain a seed culture liquid I, inoculating the seed culture liquid I in a liquid culture medium, culturing at 28-30 degrees C for 3 days under condition of shaking with velocity of 2-8 times/minute, transferring 1-2% culture liquid into a flask broth, culturing at 28-30 degrees C for 3-5 days to obtain seed culture liquid II, inoculating the seed culture liquid II in fermentation culture medium containing animal manure with humidity of 30-45%, where pH of the medium is regulated to 6.5, culturing, and cooling the medium by stirring after 24 hours to obtain white Trichoderma liquid, (b) culturing slant culture of Bacillus subtilis in a solid culture medium at 37-40 degrees C for 48 days to obtain a B.subtilis seed inoculum, inoculating and culturing seed inoculum in the solid culture medium at 37 degrees C for 24 days to obtain a seed culture liquid I, inoculating the seed culture liquid I in a liquid culture medium, culturing at 37 degrees C for 48 days under condition of shaking with velocity of 5-8 times/minute, transferring 1-2% culture liquid into a flask broth, culturing at 35 degrees C for 3-5 days to obtain seed culture liquid II, inoculating the seed culture liquid II in fermentation culture medium containing animal manure with humidity of 30-45%, where pH of the medium is regulated to 7.5, culturing, cooling the medium by stirring after 24 hours and fermenting at 30-40 degrees C for 5 days to obtain B.subtilis liquid, and (c) adding 20-30% white Trichoderma liquid, 10-15% B.subtilis liquid and 1-2% sodium carbonate to animal manure, and performing aerobic and anaerobic fermentation to obtain product.