Punching jig

The utility model provides a punching jig which comprises a base provided with a protruding part. The vacuum adsorption mechanism is fixed to the base, and a vacuum pipeline communicates to the surface, making contact with the workpiece, of the protruding part; the first limiting block and the first side pushing mechanism are arranged on the two opposite sides of the protruding part in the first direction; the second limiting block and the second side pushing mechanism are arranged on the two opposite sides of the protruding part in the second direction, and the first side pushing mechanism and the second side pushing mechanism are used for pushing the workpiece to abut against the first limiting block and the second limiting block respectively; the first direction is perpendicular to the second direction, the thrust of the first side pushing mechanism is larger than the adsorption force of the vacuum adsorption mechanism, and the thrust of the second side pushing mechanism is larger than the thrust of the first side pushing mechanism. The relative position between the workpiece and the base is limited in the three mutually perpendicular directions, and the stress of the workpiece in the corresponding direction is reasonably designed, so that the workpiece is completely positioned and clamped, the positioning precision is improved, and the machining precision and the machining quality are improved.