Bending die

The utility model relates to the technical field of metal plate bending, in particular to a bending die which comprises an upper die structure and a lower die structure, the upper die structure comprises an upper die frame and an upper cutter unit arranged on the upper die frame, and the lower die structure comprises a lower die frame and a lower cutter unit arranged on the lower die frame. The number of the upper cutter units and the number of the lower cutter units are both two, the two upper cutter units are located at the two ends of the upper die frame correspondingly, and the two lower cutter units are located at the two ends of the lower die frame correspondingly. The upper cutter unit comprises an upper mounting seat and a bending swing block arranged at the lower end of the upper mounting seat; the lower cutter unit comprises a lower cutter bending block, and a bending step is arranged on the lower cutter bending block; the bending swing block is pressed downwards along the step position of the bendi