Workpiece clamping device

The utility model provides a workpiece clamping device which comprises a supporting plate, a fixing plate is fixedly installed on one side of the supporting plate, a rotating motor is fixedly installed on the fixing plate, and a supporting frame is fixedly installed at the output end of the rotating motor. Then rotation of a threaded column is utilized, the threaded column drives an extrusion plate to move downwards to extrude the workpiece, then the workpiece is fixed, the extrusion plate moves downwards and drives a clamping groove to extrude the inclined face of a limiting plate at the same time, the limiting plate is shrunk towards one side, then reset of a reset spring is utilized for driving one end of the limiting plate to enter the clamping groove, and the workpiece is fixed. According to the clamping device, the limiting plate limits the moving plate, so that the moving plate limits the extrusion plate for fixing the workpiece, thread slipping of the threaded column can be prevented, and the situatio