Planar target material grinding device

A plane target material grinding device comprises a box body, a positioning assembly located at the bottom in the box body and a grinding assembly located at the top in the box body. The positioning assembly comprises a supporting seat arranged at the bottom in the box body and two corner pressing air cylinders oppositely arranged at the upper end of the supporting seat and used for pressing the planar target material, servo electric cylinders A are horizontally arranged on the side faces, away from each other, of the two corner pressing air cylinders, and the servo electric cylinders A are used for driving the corner pressing air cylinders to move left and right; the grinding assembly comprises a horizontal moving device, a lifting device and a rotating device which are sequentially arranged at the top in the box from top to bottom, the horizontal moving device is used for driving the lifting device to move left and right, the lifting device is used for driving the rotating device to move up and down, the ro