Fixing clamp of round corner machine

The utility model belongs to the technical field of round corner machine fixing clamps, and particularly relates to a round corner machine fixing clamp which comprises a bottom plate, a side plate is fixedly connected to one side of the upper end of the bottom plate, a top plate is fixedly connected to the side, facing the bottom plate, of the upper end of the side plate, and a cutting assembly is fixedly connected to the lower end of the top plate. The cutting assembly is used for cutting right angles of a to-be-machined workpiece into round corners, a movable groove is formed in the upper side of the bottom plate, a positive and negative tooth lead screw is rotationally connected into the movable groove, the positive and negative tooth lead screw is in threaded connection with the clamping assembly, and the clamping assembly is used for clamping the to-be-machined workpiece. The motor drives the positive and negative tooth lead screw to enable the ball nut sleeves to move oppositely, so that the distance be