The device can pre-bend the sides of plate, feed steel plate just one time, don’t need to return can to pre-bend the sides of plate, and roll the plate. The up roller is the main drive roller, the down rollers and side roller use hydraulic drive to do elevate movement. And controlled by computer to up or down, horizontal adjust automatic, show by screen, the synchromesh accuracy attached ±0.2mm. Turnover and resume of flip-bearing used hydraulic to drive. Installed balance system on the ends of up roller, so it’s easy to unload workpiece. Adopt mobile independence operator table, so can operator at any time and any place, the machine has safety interlock device. For a world it has high technology, overall function, high accuracy and easy to operator. So it’s the model rolling machine, it’s the first choice in energy, transport, fossil oil, chemical, shipbuilding, steel and some other industries.