Maintainable automobile bottom beam one-time forming bending die

The utility model provides a maintainable automobile bottom beam one-step forming bending die which comprises a lower die base, a lower die is installed at the upper end of the lower die base through a bolt, and meanwhile an upper die is placed at the upper end of the lower die. An upper die base is mounted at the upper end of the upper die through bolts; positioning columns are welded to the periphery of the lower end of the upper die base. Guide cylinders are welded to the periphery of the upper end of the lower die base. Limiting and mounting side seat structures are supported on the front and rear parts of the left and right sides of the upper surface of the lower die seat, and extension limiting and fixing seat structures are supported on the inner sides of the limiting and mounting side seat structures. According to the utility model, through the arrangement of the limiting mounting side seat structure and the extending limiting fixing seat structure, the placed material is limited and blocked, and the