Sheet metal straightening machine has been widely used in industry, with advanced technology, high leveling precision, a wide range of processes, a high degree of automation, reliable and stable work under high strength and so on. In the process of roll leveling, the metal plate through a series of alternating bending, through the motor and PLC control of each leveling drum pressure accurate control, eliminate the internal stress, Fundamentally solve the stress of each part of the plate not the same as the leveling effect is not ideal, so as to achieve high precision leveling.