An electric saw is used for cutting a gypsum layer of a fracture patient in surgery. The electric saw is characterized by comprising an electric saw body and a positioning adjustment device; the positioning adjustment device comprises an upper fixing frame, a lower fixing frame and a fixing frame adjustable structure; the upper fixing frame is fixedly connected with the electric saw body; the lower fixing frame is used for supporting the gypsum layer; the fixing frame adjustable structure is connected with the upper fixing frame and the lower fixing frame; the fixing frame adjustable structure comprises screw holes or grooves and a fastener; the positions of the holes or the grooves formed in the upper fixing frame and the lower fixing frame are corresponding to each other; the fastener is used for connecting the screw holes or the grooves. According to the positioning adjustment device of the electric saw which is used for cutting the gypsum layer of the fracture patient in the surgery, the position of the electric saw and the gypsum layer can be fixed when gypsum of the fracture patient is dismantled and accordingly damage caused by the electric saw due to the fact that the operation is improper or the patient is afraid of moving can be prevented.