The utility model provides a feed -tank wall is inspected and cleaning device for nuclear power, belongs to nuclear electrical safety protection field, mainly solves feed -tank inspecting and clean problem at the labour during operation. The device relies on opening of device of underwater motor drive action wheel realization to stop, remove, water formation negative pressure through in a laval nozzle suction sucking disc provides the effort in the wall vertical direction, guarantees the device adherence, under the closed loop mode, rely on return circuit water pressure to guarantee that sucking disc and wall fully contact in addition, closed loop is equipped with the constant pressure valve, job stabilization nature in the time of both can having guaranteed closed loop and open route modeswitch, and the sucking disc of can in good time discharging again inhales the rivers in the return circuit, when mode switch when the open route, through the water pump pressurization, realize the cleanness to the dirt, fluidic reaction force can effectively be offset in the reinforcing of sucking disc adhesive force this moment. The method that this patent provided has compact structure, the stable advantage of operation.