NOVELTY - Composite microbial inoculum comprises five high-temperature microorganism strains based on a proportion, each of which is subjected to amplification culture, and the five high-temperature microorganism strains are as follows: (a) Geobacillus E3 strain, (b) Bacillus licheniformis DG-3 strain, (c) Trichoderma M8 strain, (d) Trichoderma M26 strain, and (e) Streptomyces CCS3 strain.    USE - The composite microbial inoculum is useful for promoting fast corrupting (claimed).    ADVANTAGE - The quality of the product satisfies the standard of harmless and reduction. It is environment friendly and economical.    DETAILED DESCRIPTION - Composite microbial inoculum comprises five high-temperature microorganism strains based on a proportion, each of which is subjected to amplification culture, and the five high-temperature microorganism strains are as follows: (a) Geobacillus E3 strain, (b) Bacillus licheniformis DG-3 strain, (c) Trichoderma M8 strain, (d) Trichoderma M26 strain, and (e) Streptomyces CCS3 strain; the five high-temperature microorganism strains are subjected to amplification culture respectively, and they are used for preparing the composite microbial inoculum based on the proportion by weigh part of 20 to 30: 10 to 20: 10 to 25: 10 to 20: 20 to 35, according to the order E3, DG-3, M8, M26, CCS3. An INDEPENDENT CLAIM is a method for inoculating a composite microbial inoculum into compost for promoting fast corrupting, comprising: (a) mixing crushed straw with fresh animal dejection, then controlling the water content of the mixture at 65 to 70%, and then regulating the pH value to about 7.6 to 8.0; (b) inoculating the composite microbial inoculum of 0.1 to 0.5% of the compost by weight into the compost, then turning and mixing well, and then transferring into a fermentation tank to carry out aerobic fermentation; (c) symmetrically infusing air into the fermentation tank through an air compressor, where the air amount and the time for infusing air are different to the different fermentation stages; (d) measuring the temperature and turning the compost at regular time; and (e) regularly detecting, namely, sampling from the different positions of the compost, and analyzing the biological indexes and physicochemical indexes of the sample, where the compost is corrupted completely when the indexes meet the standard.