Silencer drainage structure

The invention relates to a silencer drainage structure of an engine exhaust system. The silencer drainage structure comprises a silencer tube body and is characterized in that multiple rows of inner drainage holes are formed in the silencer tube body in the tube wall circumferential direction. Multiple outer drainage holes are formed in the middle of a resonant cylinder, the resonant cylinder sleeves the silencer tube body and wraps multiple rows of inner drainage holes, two ends of the vibrating cylinder are fixedly connected with the silencer tube body, a resonant cavity is formed between the outer wall of the silencer tube body and the inner wall of the resonant cylinder, and silencing cotton is filled in the resonant cavity. The silencer drainage structure is simple and reliable, can timely drain water accumulated in a silencer pipeline, prevent pipeline corrosion and can further reduce noise.