Pipe outer wall cleaning device

The invention relates to the technical field of cleaning devices, and particularly discloses a pipe outer wall cleaning device which comprises a water tank and a cleaning tank. The cleaning box is arranged at the top of the water tank, an inlet and an outlet are formed in the side walls of the two ends of the cleaning box correspondingly, and a first cleaning cavity and a second cleaning cavity are formed in the cleaning box. A rotating cutter is rotationally arranged on the inner side wall of the first cleaning cavity; a first spraying pipe located on one side of the rotating cutter is fixedly connected to the inner side wall of the first cleaning box. A first nozzle is arranged on the outer side wall of the first spraying pipe; the inner side wall, away from the rotating cutter, of the second cleaning cavity is fixedly connected with a first supporting block allowing a pipe to penetrate through. A second spraying pipe is arranged on the side wall of the first supporting block; a second nozzle is arranged on