Fuente: WIPO "circular economy" The invention discloses a technology for reducing malodorous gas generated in the harmless treatment process of livestock and poultry died of diseases, relates to the technical field of environmental protection, and aims to solve the problems that most of current treatment methods for the malodorous gas generated in the harmless treatment process of the livestock and poultry died of diseases are of a filtering type, the consumable cost is high, and meanwhile, the rapid purification effect is not achieved. The method solves the technical problems in the prior art that the livestock and poultry carcasses are easily subjected to secondary pollution to the surrounding environment and complaints of the masses around a treatment plant are caused, and comprises the following steps of safe collection and transportation, malodorous gas inhibition treatment, malodorous gas filtration treatment, livestock and poultry carcass crushing, high-temperature chemical treatment and fermentation production flow. The livestock and poultry carcass filtering device has the advantages that acidic foul gas generated by livestock and poultry carcasses is neutralized and reduced, pore structures in livestock and poultry carcass fragments are increased, the filtering cost is reduced, the problem of secondary pollution to the surrounding environment is avoided, and complaints of the masses around a treatment plant are reduced.