Silencer for diesel engine

The utility model discloses a silencer for a diesel engine, which comprises an inner cavity and an outer casing. Filtering materials are filled in the inner cavity, a cavity is reserved between the outer wall of the inner cavity and the inner wall of the outer casing, and heat insulation and noise elimination materials are arranged in the cavity and are glass fibers. The heat insulation and noise elimination materials are arranged in the cavity between the outer wall of the inner cavity and the inner wall of the outer casing of the silencer. Compared with an existing form of expanding a cavity to realize noise elimination and heat insulation by the aid of air only, the silencer not only increases noise elimination and heat insulation effect, but also does not increase the size of the outer casing, is compact in structure, can save materials and reduces manufacturing cost.