The structure of the four rollers rol bending machine is a four-roller type. The upper roller is the main transmission. The output gear of the reducer meshes with the upper roller gear to provide torque for the rolled sheet. The lower roller makes vertical lifting movement and uses the hydraulic pressure in the hydraulic cylinder. It is obtained by the piston in order to clamp the plate for hydraulic transmission. Side rollers are provided on both sides of the lower roller and tilted along the guide rail of the rack. The four-roller plate rolling machine is suitable for the bending and forming of metal plates. It can roll round, arc and conical workpieces within a certain range, and has the function of pre-bending the end of the plate. The metal plate can be roughly leveled on this machine.