Reinforcing structure and forming tool

The utility model provides a reinforcing structure and a forming tool, and relates to the technical field of aluminum die bay window construction. The reinforcing structure comprises a first fixing piece, a second fixing piece, a third fixing piece and a top support, the first fixing piece is fixed to the first vertical plate, the second fixing piece is fixed to the bottom plate, the third fixing piece is fixedly connected with the second fixing piece and abuts against the first fixing piece, and the top support is fixed to the bottom plate. One end of the top support abuts against the first fixing piece and the third fixing piece at the same time, and the other end of the top support abuts against the second vertical plate, so that the first vertical plate, the second vertical plate and the first bottom plate can be tightly pressed on a bay window sill low wall. Compared with the use of an opposite-pull screw, the reinforcing structure can reduce the number of punched holes in the bay window sill low wall an