The invention discloses an automatic sandblasting and derusting device between wing walls. The automatic sandblasting and derusting device is characterized in that the sandblasting and derusting device consists of a body frame, a sandblasting machine, a sandblasting trolley and a lifter, wherein the body frame is in a frame structure formed by welding an upright post on a base with a transverse strut; a track and an arm brace are arranged on one side of the body frame; the track is fixedly arranged on the transverse strut and is parallel to the body frame; the arm brace is fixedly arranged on the upright post and is vertical to the upright post; the lifter is fixedly arranged on the base on one side of the body frame; the sandblasting trolley is a movable sandblasting gun arranged on the track; the movable sandblasting gun is connected with the sandblasting machine through a hose; the upper and the lower ends of the sandblasting trolley are connected with the lifter through wire cables; and the wire cables are arranged on the body frame through pulley wheels. Compared with the prior art, the automatic sandblasting and derusting device between wing walls has the advantages of being high in production efficiency and low in labor intensity, thereby efficiently avoiding the influence of dust to the health of people, being capable of saving about one-third sandblasting labor and reducing more than 60% of scaffold building work.