The cathode scrubbing unit is mainly used to thoroughly clean the cathode plate before returning the cathode plate to the electrolytic cell. The utility model is composed of a reversible washing and conveying line and a scrubbing device. The scrubbing device is arranged in the middle of the conveying line, and the two cathode plates are lifted by one washing, and the washing brush is finished by the high-speed rotating washing roller during the lifting process, and is used by the automatic stripping unit.