The utility model discloses a rainproof silencer. The rainproof silencer comprises a silencer body, a water drainage ring, a smoke discharge pipe and a hoop, the bottom end of the silencer is provided with an air exhaust inlet end, the top end of the silencer body is provided with an air exhaust outlet end, the water drainage ring is sleeve-shaped, the outer wall of the sleeve is provided with a plurality of grooves axially along the sleeve, and the water drainage ring is arranged at the air exhaust outlet end; the bottom end of the smoke discharge pipe is inserted onto the outer wall of the water drainage ring, the grooves and the wall of the smoke discharge pipe form water flow channels, and the hoop is used for hooping the bottom end of the smoke discharge pipe on the water drainage ring. The rainproof silencer can prevent rainwater from entering an engine and is simple and practical.