The utility model provides a hydraulic bending machine which comprises two movable clamping plates. The two movable clamping plates are provided with fixing holes and matched with each other. The movable clamping plates are further provided with fixing bolts matched with the fixing holes. The hydraulic bending machine further comprises two movable idler wheels provided with center holes, an angle jacking block, a piston rod, a lead screw and nut mechanism, a hydraulic assembly and a stress application rod. The angle jacking block and the two movable idler wheels are arranged between the two movable clamping plates. The fixing bolts sequentially penetrate through the fixing holes and the center holes in the movable idler wheels to connect the two movable clamping plates. The movable clamping plates are connected with a nut of the lead screw and nut mechanism. The angle jacking block is connected with the piston rod. The two ends of a lead screw of the lead screw and nut mechanism are connected with the piston rod and the hydraulic assembly respectively. The hydraulic assembly is connected with the stress application rod. An oil return valve bolt is arranged at the position where the lead screw is connected with the hydraulic assembly. According to the hydraulic bending machine, the weight is low, the technological operation is simple, construction efficiency is improved, bent point positions of finished products manufactured by the hydraulic bending machine are flat and straight, various types of bent angles are provided, the angle range is wide, and the finished products are good in quality.