Off-line surfacing welding device of coal mill

The utility model discloses and provides a coal mill off-line surfacing device which comprises a fixing base, a first workbench and a second workbench are fixedly installed on the two sides of the outer surface of the top end of the fixing base respectively, clamping plates are fixedly installed at one ends of air cylinders, a roller sleeve is clamped between the clamping plates, one end of a fixing plate is connected with a motor, and the other end of the fixing plate is connected with a second workbench. By driving the air cylinder, the clamping plates can clamp the roller sleeve, the inner wall of the roller sleeve cannot make contact with a roller core, independent off-line surfacing is achieved, the air cylinder can rotate under the action of the bearing seat, the air cylinder can rotate by driving the motor, and therefore the roller sleeve can be clamped by the clamping plates, and the roller sleeve can be clamped by the clamping plates. According to the surfacing device, the outer surface of the roller