The invention relates to preparation and application of a household garbage deodorizing microorganism environmental degerming agent. The household garbage deodorizing microorganism environmental degerming agent mainly comprises bacillus licheniformis, bacillus subtilis, bacillus natto, candida utilis, sporobolomyces, chromogenic thermomonospoaceae and aspergillus oryzae. According to the preparation method of the household garbage deodorizing microorganism environmental degerming agent, bacteria, molds, yeasts and actinomycetes are cultivated in different manners, and through liquid culture and solid culture, are crushed and mixed in proportion to produce the household garbage deodorizing microorganism environmental degerming agent. When added into household garbage at a certain proportion, the household garbage deodorizing microorganism environmental degerming agent can absorb odorous gases such as hydrogen sulfide and ammonia generated during degradation of household garbage to eliminate the odor of the household garbage and leakage liquid, thereby inhibiting growth of putrefying bacteria, promoting decomposition of the household garbage and fundamentally eliminating odors, and during the process, the average removal rate of NH3 is 97.85%, the average removal rate of H2S is 98.12%, the average removal rate of odor concentration is 90.12%, and the average removal rate of other microorganism.