Progressive die punch forming machining device and machining method for U-shaped part with hole

The invention discloses a progressive die punch forming machining device and method for a U-shaped part with a hole. The machining device comprises an upper die, a lower die, a reciprocating driver and a progressive feeder. The upper die comprises an upper die base, an upper padding plate, an upper clamping plate, a stopping plate and a stripper plate. The lower die comprises a lower die plate, a lower base plate and a lower die base. The progressive feeder feeds a plate to be machined into the position between the upper die and the lower die from one side of the progressive die punch forming machining device for the U-shaped part with the hole, and the plate to be machined is subjected to punch machining treatment in the process that the upper die gets close to the lower die. And after a to-be-processed plate is fed between the upper die and the lower die by the progressive feeder, the reciprocating driver drives the upper die to approach the lower die to carry out stamping processing treatment on the to-be-