According to the structural features and process analysis of box-shaped part with bayonet, the layout design of multi-position progressive die was optimized. Then, a new process of press-forging was put forward, which first cold-forged a groove with the depth of 0. 8 mm on an aluminum plate with the thickness of 1 mm, and extruded two inclined bosses on the back of the groove, and then bent the groove at a right angle along the set bending path to fit the two inclined bosses together, so as to obtain a bayonet with high strength and good sealing. Furthermore, the integrated die structure of blanking and bending was given, using the double floating mechanism, the edge scraps between carriers and workpiece were cut off by the cutting punch which was located on both sides of bending punch and 4 mm higher than it, at the same time, the workpiece was bent by the bending punch. Finally, the secondary floating mechanism was discussed, which consisted of two push blocks. Under the action of spring force, the first push block stopped moving when it pushed the part to the position flush with the upper surface of the bending die, and the second push block continued to move, pushing the pins of part stuck in the die cavity out of the die surface. The test stamping results show that the multi-position progressive die for box-shaped part with bayonet has a unique structure and a novel design, which can meet the requirements of high-precision dimensions for the parts.