Bending forming device for U-shaped profile steel

The utility model relates to the technical field of forming devices, and discloses a bending forming device for U-shaped profile steel. The bending forming device comprises an upper die base, a lower die base, a male die, a first rotary inserting block and a second rotary inserting block, wherein the male die is fixed on the upper die base; one end, which is far away from the upper die base, of the male die has a forwards-bulged structure; a U-shaped groove is formed on the lower die base; an inserting block mounting groove is formed at the bottom of the U-shaped groove in the direction which is perpendicular to the U-shaped groove; the first rotary inserting block and the second rotary inserting block are arranged in the inserting block mounting groove; and the joining position of the inserting block mounting groove between the first rotary inserting block and the second rotary inserting block is lower than groove openings on two sides. By the bending forming device, the problems of corrugation on side walls and pressing marks at the bottom during the bending forming of the U-shaped profile steel are solved; and a forming process is simplified, and the production efficiency is improved. The bending forming device is obvious in effect, reasonable in structure and high in practicality.