Online roller cleaning device for cold roller

The utility model discloses an on-line roller cleaning device for a cold roller, which comprises two support plates, the cold roller is rotatably arranged between the two support plates, cleaning brush plates are arranged on two sides of the cold roller, a moving component is arranged at the bottom of each cleaning brush plate, a reciprocating screw rod is sleeved in the moving component in a threaded manner, and the reciprocating screw rod is connected with the cleaning brush plates. The reciprocating screw rod is rotatably arranged on the supporting plate, one end of the reciprocating screw rod is fixedly connected with a double-shaft motor fixedly connected with the supporting plate, an output shaft at the right end of the double-shaft motor is fixedly connected with a gear speed increaser, the output end of the gear speed increaser is fixedly connected with an air blowing assembly, and the air blowing assembly is sleeved with an air inlet cover. And one end of the air inlet cover is fixedly connected with