Protection device used in lateral position operation

The utility model discloses a protection device used in a lateral position operation. Lateral lying plate, slideways are arranged on two side surfaces of the side lying plate along the front-back direction; three U-shaped plates are arranged in each of the slideways on the two sides; a back fixing plate, a waist fixing plate and a hip fixing plate are respectively connected to upper flange platesof the three U-shaped plates on one side of the side lying plate in the front-back direction; the rear part of a web plate of one U-shaped plate on the other side of the side lying plate is connectedwith an arm placing plate; upper flange plates of the other two U-shaped plates are connected with a chest fixing plate and an abdomen fixing plate in the front-back direction correspondingly. A plurality of positioning holes are formed in the edges of the two sides of the upper surface of the side lying plate, a positioning pin is arranged on an upper flange plate of each U-shaped plate in a penetrating mode, the front po