Shandong Boxing Longtai Forging Equipment Co., Ltd. is mainly engaged in the design, manufacture, installation, commissioning and maintenance of various types of steel plate opening and leveling machine, steel plate slitting machine, stainless steel leveling machine, color coating galvanized cold rolling production line, etc. The rigid supporting roll is set outside the upper and lower rows of work rolls of the steel plate flattening machine, which forms a quadruple roller group structure. The flatness of sheet metal can be obviously improved and the quality of the workpiece can be improved by leveling the plate with this machine. It can work independently and can be used for the leveling of single plate; it can also be equipped with uncoiling and drawing material in front of the machine, and the shearing, stacking and on-line mechanism are configured at the back of the machine to form a production line with complete performance through the control system to level and cut the metal coil.