Cleaning device in boiler pressure vessel cavity

The utility model discloses a cleaning device in a boiler pressure vessel cavity, which comprises a mounting hanger plate, and an electric telescopic mechanism is connected to the middle of the lower end of the mounting hanger plate. According to the device, the device is erected above the opened boiler, an inclination for cleaning scale is introduced into the boiler, the cleaning mechanism moves up and down in the boiler by starting the electric telescopic mechanism, and a rotating motor on the cleaning mechanism is started to drive the cavity side wall cleaning mechanism and the cavity bottom cleaning mechanism to rotate; side wall cleaning brush balls and cavity bottom cleaning brush balls on the outer walls of the cavity side wall cleaning mechanism and the cavity bottom cleaning mechanism are used for brushing the side wall and the bottom of the inner cavity of the boiler, and an electric telescopic mechanism is matched for lifting the cleaning mechanism, so that the cleaning mechanism moves up and down