Bending machine is a machine capable of bending thin plates, its structure mainly includes support, bench and clamp plate, the bench placed on the bracket, the bench consists of base and press plate, base connected to the clamp plate by hinge, the base consists of seat housing, coil and cover, coil in the housing depression, the depression top is covered with a cover plate. When use, the wire energizes the coil, and the pressing plate will gravitate, so as to clamp the thin plate between the pressing plate and the base. Due to the use of electromagnetic force holding, the pressure plate can be made into a variety of workpiece requirements, and can be the workpiece with a side wall can be processed, the operation is also very simple. The bending machine is divided into manual bending machine, hydraulic bending machine and numerical control bending machine.