The invention discloses an organic garbage deodorant based on earthworm cast and compound microorganisms. The organic garbage deodorant comprises raw materials in parts by weight as follows: 80-120 parts of earthworm cast, 1-2 parts of bacillus subtilis, 1-2 parts of nitrite bacteria, 1-2 parts of sulfur bacteria and 1-2 parts of thiobacillus dentrificans. The earthworm cast is taken as a growth accelerant for beneficial microorganisms, the obtained organic garbage deodorant based on the earthworm cast and the compound microorganisms can decompose ammonia, amine salt, sulfide and other harmful substances with odors, bacterial agents and other substances in the organic garbage deodorant based on the earthworm cast and the compound microorganisms perform a mutual synergistic effect, the purpose of garbage reducing and deodorizing is achieved, and waste organic garbage can be used for producing bio-organic fertilizers and turned into wealth. Compared with the prior art, the organic garbage deodorant used for garbage reducing and deodorizing has the advantages that little productive investment is required, the product cost is low, the treatment efficiency is high, the application range is wide and the organic garbage deodorant is completely environment-friendly and convenient to use.