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The invention relates to a system for breeding hermetia illucens for treating livestock and poultry manure and application thereof. The system for breeding the hermetia illucens for treating the livestock and poultry manure comprises an adult breeding room, a larva incubation room, a breeding pond and a hermetia illucens and manure separator. The application comprises the following treatment steps of breeding hermetia illucens adults in the adult breeding room to obtain eggs, hatching the eggs and breeding larvae in the larva incubation room, breeding the hermetia illucens in the breeding pond to treat the livestock and poultry manure, carrying out hermetia illucens and manure separation by using the hermetia illucens and manure separator, respectively utilizing hermetia illucens bodies and hermetia illucens manure, drying and grinding the hermetia illucens bodies to obtain protein feed, or directly feeding fish, shrimps, livestock and poultry with the hermetia illucens bodies, and using the hermetia illucens manure as an organic fertilizer after being aired. According to the method, a closed-loop breeding process from the hermetia illucens eggs to the hermetia illucens adults is formed, the larvae do not need to be purchased from the outside, the organic fertilizer and the hermetia illucens body protein feed can be continuously obtained, the method is a harmless and resource utilization method for the livestock and poultry manure, and good ecological benefits, social benefits and economic benefits are achieved.