Natural gas engine postprocessor

The utility model belongs to the technical field of automobile waste gas treatment, and particularly relates to a natural gas engine postprocessor which comprises a shell, a carrier packaging body anda tail pipe, a silencing cavity, a first mixing cavity and a second mixing cavity are formed in the shell, and a sound absorption plate is arranged in the silencing cavity; the carrier packaging bodyis configured to react with tail gas and ammonia gas, the carrier packaging body is arranged in the first mixing cavity, and the two ends of the carrier packaging body communicate with the silencingcavity and the second mixing cavity; one end of the tail pipe communicates with the silencing cavity, and the other end of the tail pipe penetrates through the first mixing cavity and extends out of the second mixing cavity to exhaust tail gas. The silencer has the advantages that ammonia gas is prevented from escaping, the silencing effect is good, and meanwhile the size of the postprocessor is reduced. 本实用新型属于汽车废气处理技术领域，具