The invention discloses a punching auxiliary tool of a vehicle type name plate. The punching auxiliary tool comprises a fixing plate and a positioning mechanism, wherein the positioning mechanism can be overturned relative to the fixing plate through a hinging piece, the positioning mechanism comprises a positioning plate and a vertical column, the positioning plate is provided with a plurality of guiding columns which are vertical to the positioning plate, the centers of the guiding columns are provided with guiding holes which penetrate through the positioning plate, the positioning plate is provided with a sliding groove which is horizontally arranged under the guiding columns, two ends of the sliding groove are respectively provided with a side baffle plate, the sliding groove is internally provided with a sliding block which is fixedly connected with the vertical column, and return springs are respectively arranged between the side baffle plates and the sliding block. According to the punching auxiliary tool of the vehicle type name plate, disclosed by the invention, quick positioning can be realized, and the hole position deviation can be reduced.