Multifunctional grinding clamp

The utility model discloses a multifunctional grinding clamp which comprises a base, a mounting seat is fixedly connected to one side of the upper surface of the base, a clamping mechanism is arranged on the mounting seat and comprises a mounting frame, a bolt is connected to the top of the inner wall of the mounting frame in a threaded penetrating mode, and a fixing rod is fixedly connected to the bottom of the inner wall of the mounting frame. One end of the fixing rod and one end of the bolt are rotationally connected with a connecting base in a penetrating mode, a suction cup is fixedly connected to the connecting base, and a turnover mechanism is arranged on one side of the mounting frame. A workpiece to be machined is placed on the suckers of the fixing rod, the workpiece is pressed downwards, the lower surface of the workpiece is attracted to one of the suckers, then the bolt is rotated and tightened, the bolt drives the other sucker to move downwards, the other sucker is squeezed and attracted to the