Punching machine with workpiece positioning device

The utility model discloses a punching machine with a workpiece positioning device, and relates to the technical field of auxiliary positioning of punching machines. The device comprises a table plate and an installation plate arranged on one side of the table plate, the installation plate is connected with the table plate through a fixing assembly, a positioning plate is arranged on the installation plate, a pressing assembly used for forcing the positioning plate to be close to one side of the positioning plate is arranged on the installation plate, a movable cavity is formed in the positioning plate, and the movable cavity is arranged in the movable cavity. A movable rod matched with the movable cavity is arranged in the movable cavity, and hinge rods matched with the movable cavity are hinged to the two sides of the movable cavity. The three positioning wheels can be synchronously driven to get close to one another through the driving assembly, then the side wall of a cylindrical workpiece is clamped and