Casting workpiece machining clamp

The cast workpiece machining clamp comprises a fixed table and a rotary table, a fixed cavity is formed in the center of the rotary table, a rack is fixedly installed on the top face, on the outer side of the fixed cavity, of the rack, three sets of notch grooves are evenly formed in the rack, clamping blocks are arranged in the three sets of notch grooves, one side wall of each clamping block is arranged on the outer wall of a guide seat in a sliding mode, and the guide seat is welded to the top face of the rotary table. According to the clamping device, the arranged fixing cavity can play a role in preliminarily limiting a workpiece, and one side wall of the guide seat is obliquely arranged, so that the clamping block and the guide plate are driven by the driving mechanism to move in the vertical direction and move in the transverse direction at the same time, that is, the clamping block moves downwards and moves in the center direction of the fixing cavity at the same time; and the three sets of clamping b