The internal connection between the plum blossom and the hexagon of the steering system of the car, because it is a blind hole, the cold punching method can be used, and the hexagonal punch or the plum blossom punch can be used to quickly complete the punching on the small cold punching machine. The plum blossom in the steering rod and the plum blossom punch are punched with a hexagonal plum blossom punch, which guarantees accuracy and higher efficiency. The special hexagonal punch plum blossom punch for automobile steering rods can achieve a higher life.