Composite iron roughneck and sliding device thereof

The utility model discloses a composite iron roughneck and a sliding device thereof, and the composite iron roughneck comprises a telescopic arm iron roughneck which is provided with a rotary assembly; and the sliding device comprises a horizontal pulley, a sliding oil cylinder, a guide rail, a mounting lug seat and a locking pin shaft. The horizontal pulley is connected with the iron roughneck rotation assembly through a bolt; one end of the sliding oil cylinder is connected with the mounting lug through a pin shaft, and the other end is connected with the horizontal tackle through an oil cylinder trunnion; the mounting lug seat and the guide rail are welded on the drill floor surface; the horizontal tackle is installed in the guide rail, the horizontal tackle drives the iron roughneck to achieve overall horizontal sliding under the action of the sliding oil cylinder, and after the iron roughneck slides in place, the iron roughneck is locked through the locking pin shaft. The integral sliding function of the