Numerical control surface grinder workpiece supporting and fixing device

The utility model discloses a workpiece supporting and fixing device of a numerical control surface grinding machine. The device comprises a chassis and a rotating motor, the chassis is fixedly arranged at the rotating output end of the rotating motor; a rail frame is fixedly arranged on the upper surface of the chassis; two sets of symmetrically-arranged pressing plates are arranged at the two ends of the rail frame in a sliding mode. A crank is rotationally arranged in the middle of the rail frame, the two ends of the crank are hinged to one ends of connecting rods respectively, the other ends of each set of connecting rods are hinged to the surface of a pressing plate, the lower surface of one end of the crank is hinged to the telescopic end of an oil cylinder, and the oil cylinder is arranged on the upper surface of the chassis. The clamping device is simple in structure, convenient to operate, capable of rapidly achieving simultaneous clamping of two sets of workpieces, simple instructure, high in practi