The invention provides a compound microbial bacterium for an aerobic fermentation stage. The compound microbial bacterium for an aerobic fermentation stage is prepared by culturing, fermenting, drying and mixing Bacillus licheniformis, Bacillus subtilis, saccharomycete, 5406 actinomycete, Trichoderma viride, Aspergillus oryzae and pseudomonad respectively, wherein the compound microbial bacterium comprises the following components in parts by weight: 0.7-1.2 parts of Bacillus licheniformis, 0.7-0.8 part of Bacillus subtilis, 1.1-1.2 parts of saccharomycete, 1.5-2.5 parts of 5406 actinomycete, 1-2 parts of Trichoderma viride, 1-2 parts of Aspergillus oryzae and 0.5-1 part of pseudomonad. The compound microbial bacterium for an aerobic fermentation stage has phosphate-solubilizing, potassium-solubilizing and nitrogen-fixing capabilities, and can quickly decompose organic substances, so that materials are thoroughly decomposed, and oxidation-resistant substances are generated through metabolism, thus generating a complex and stable ecological system; and the heating speed is high in the whole fermentation process, the temperature can be up to 50 DEG C or above within 1-2 days, and undesirable odor starts to disappear within 24 hours.