Flatness correcting device

The utility model discloses a planeness correcting device which comprises a frame body, the bottom of an inner cavity of the frame body is sequentially connected with a box body and first linear motors through bolts from left to right, the number of the first linear motors is two, and the tops of the first linear motors are connected with a protection box through bolts. And an inner cavity of the protection box is connected with a threaded rod through a bolt, the surface of the threaded rod is sleeved with two moving blocks in a threaded mode, and a fixing mechanism is arranged at the bottom of each moving block in a penetrating mode. Through the cooperation of the first linear motor, the threaded rod, the moving block, the rotating motor, the first air cylinder, the connecting plate, the pressure sensor and the pressing plate, the device has the advantage of being capable of effectively fixing the flatter end, so that the device has a good fixing effect on different parts, flatness correction is facilitated,