Environment-friendly silencer of heavy-duty vehicle

The utility model belongs to the technical field of silencers and discloses an environment-friendly silencer of a heavy-duty vehicle. The environment-friendly silencer is mainly and technically characterized by comprising a shell with a gas inlet and a gas outlet, wherein the wall of the shell consists of an outer-layer shell wall and an inner-layer shell wall; and an asbestos fiber noise-reducing and heat-insulating layer is arranged between the outer-layer shell wall and the inner-layer shell wall. The environment-friendly silencer provided by the utility model has the advantages that since the wall of the shell consists of the outer-layer shell wall and the inner-layer shell wall, and the asbestos fiber noise-reducing and heat-insulating layer is arranged between the outer-layer shell wall and the inner-layer shell wall, the double-wall silencer is good in silencing effect, less in environmental pollution and low in noise compared with a single-wall silencer.