The invention relates to the technical field of fluid machines, in particular to a pipeline steam purging silencer. Sundries like rust scales and welding slag which are blown down and adhere to the left side face of a filter plate can be cleared up conveniently, and the steam conveying effect is improved. Meanwhile, the filter plate can be cleaned and replaced conveniently, and the usability is improved. Moreover, a silencing dielectric layer can be replaced independently, replacement cost is reduced and using reliability is improved. The pipeline steam purging silencer comprises a shell and the filter plate. The silencing dielectric layer is arranged in a working cavity. The pipeline steam purging silencer further comprises a shielding part, a driving part and a cleaning part. The shielding part is located on the outer side of the driving part. The pipeline steam purging silencer further comprises a discharging hopper, a first sealing ring and a first fixing part. A stopping cover isarranged at the output end of the discharging hopper, and the first fixing part is arranged on the discharging hopper. The pipeline steam purging silencer further comprises a second sealing ring and asecond fixing part. The second sealing ring is arranged on the outer side wall of the input end of the second fixing part, and the outer side wall of the second sealing ring makes contact with the inner side wall of a second installation opening.