Overturn clamping device

The utility model discloses an overturn clamping device, which comprises a clamping jaw, a side plate, a clamping seat, a first leadscrew seat, a leadscrew and a second leadscrew seat, and is characterized in that the clamping jaw is connected with the leadscrew, is placed in a traveling cavity which is formed by the side plate, the first leadscrew seat and the second leadscrew seat, and is connected with the clamping seat. After a workpiece is clamped and positioned, the required overturn angle and position can be selected by overturning a main machine. The clamping jaw and the leadscrew are driven through the meshing of a swivel nut or a nut, the clamping jaw is provided with the swivel nut or the nut, the clamping jaw is driven by the rotation of the leadscrew to move to the corresponding or opposite direction, so the opening or closing purpose is realized, and the angle or position of the overturned clamping seat can be controlled through the equipped main machine.