Clamping device for thin plate workpiece with hole

The invention provides a clamping device for a thin plate workpiece with a hole. The clamping device comprises a base, wherein a fixing platform which is used for supporting the workpiece is arranged on the base. The clamping device further comprises an inner hole supporting structure and a clamping mechanism, wherein the inner hole supporting structure is used for passing through the workpiece middle hole, and the clamping mechanism is used for clamping the workpiece on the side. The workpiece is clamped by the clamping mechanism after the workpiece middle hole is fixed by the inner hole supporting structure, and therefore the deformation of the middle hole can be effectively avoided, the deformation in the clamping process of the workpiece is reduced, then the value of whole deformation resilience, generated after machining is accomplished, of the workpiece is reduced, and the machining accuracy is guaranteed. The workpiece is firmly positioned by the clamping device, machining of the surface and the surfac