Mute noise reduction well lid convenient to replace

The invention belongs to the technical field of inspection well lid equipment, and particularly relates to a convenient-to-replace mute noise reduction well lid which comprises a base and a cover plate. The device comprises a base, a cover plate and a locking and fixing mechanism, the locking and fixing mechanism is installed on the inner ring face of the base and used for locking and fixing the cover plate, the locking and fixing mechanism comprises a bearing ring, the bearing ring is fixedly connected to the inner ring face of the base, and the cover plate is placed on the bearing ring; the buffering ring is installed on the side, close to the bearing ring, of the cover plate, and the buffering ring is used for making the cover plate make elastic contact with the bearing ring; the pressurizing mechanism is mounted between the cover plate and the bearing ring; through the locking and fixing mechanism and the pressurizing mechanism, tight connection between the cover body and the base is achieved, looseness b