NOVELTY - A compound microbial fermentation inoculum for producing organic fertilizer by using decomposed organic waste, comprising two types of microbial inoculums, namely a compound microbial inoculum 1 and a compound microbial inoculum 2 which are applied to the main fermenting period and the post fermenting period, is new.    USE - The compound microbial fermentation inoculum is useful for producing organic fertilizer by using decomposed organic waste (claimed). It can also be used in the fields of efficiently and rationally utilizing agricultural wastes, and processing wastes.    DETAILED DESCRIPTION - A compound microbial fermentation inoculum for producing organic fertilizer by using decomposed organic waste, comprising two types of microbial inoculums, namely a compound microbial inoculum 1 and a compound microbial inoculum 2 which are applied to the main fermenting period and the post fermenting period, where the compound microbial inoculum 1 is composed of ten bacterial strains separated from two eumycete strains with strong cellulose decomposing capacity and high temperature (65 degrees C) resistance selected from pig manure, chicken manure, cow manure, straw and sludge compost, three introduced eumycete strains, two deodorizing bacterial strains, one lactobacillus strain and two nitrobacteria strains; the compound microbial inoculum 2 is composed of six bacterial strains, comprising one azotobacter strain, one phosphate-dissolving bacteria strain, one potassium-releasing bacteria strain, one lactobacillus strain and two lactobacillus strains; one lactobacillus strain and two lactobacillus strains are partially added in the microbial inoculum 1 and the microbial inoculum 2, respectively; the microbial inoculum has strong ability on decomposing cellulose and xylogen, it can increase the piling temperature quickly, accelerate the decomposing speeding of the substance, fix the nutritive substance and shorten the innoxious staying time of the piled waste so as to utilize the waste and reduce environmental pollution; the microbial fermentation inoculum can be utilized to treat organic materials such as livestock and poultry wastes (comprising cow manure, pig manure, chicken manure and sheep manure), straws (corn straw, and wheat straw), sludge, fungi dregs, garden shearing objects and other wastes (such as grass carbon, castor bran, bone powder and bean pulp powder) enriched with cellulose, is new.