Vacuum-damping exhaust silencer

The invention discloses a vacuum-damping exhaust silencer. An intake pipe and an exhaust pipe of the vacuum-damping exhaust silencer are respectively arranged at the two ends of a silencer housing, and the vacuum-damping exhaust silencer further comprises a division board, a first micro-perforated panel, a second micro-perforated panel, a first communicating pipe and a second communicating pipe; the division board, the first micro-perforated panel and the second micro-perforated panel are sequentially arranged in the silencer housing at intervals from the intake pipe to the exhaust pipe and sequentially divide the silencer housing into a first buffering cavity, a second buffering cavity, a third buffering cavity and a fourth buffering cavity; the first communicating pipe is arranged in the silencer housing and communicated with both the first buffering cavity and the fourth buffering cavity; the second communicating pipe is arranged in the silencer housing and communicated with both the third buffering cavity and the fourth buffering cavity. Together with small-hole jetting and impedance silencing, noise produced during steam vacuum emission is reduced, environmental noise pollution is decreased, and normal operation of air power equipment is guaranteed.