Cathode roller anti-oxidation preheating protective cover device

The utility model relates to a cathode roller anti-oxidation preheating protective cover device which comprises a protective cover body arranged on the outer side of the roller surface of a cathode roller, and a spraying pipe is arranged on the inner surface of the protective cover body in the length direction of the protective cover body. A plurality of first spraying holes are evenly formed in the side, facing the cathode roller, of the spraying pipe in the length direction of the spraying pipe, and a certain angle is formed between the spraying direction of electrolyte sprayed out of the first spraying holes and the roller face of the cathode roller. The protective cover body is arranged outside the cathode roller and used for preventing dust of the cathode roller, meanwhile, the spraying pipe is arranged on the inner side of the protective cover body, and a certain amount of electrolyte is sprayed to the cathode roller to prevent a titanium layer of the cathode roller from making contact with air, so that