The utility model belongs to the technical field of steel production equipment, and particularly relates to a 550V rolling mill pressing device which comprises a worm and gear box, a through cover, apressing ejector rod, a worm gear, a worm, thrust bearings, an upper base plate and a lower base plate, and the thrust bearings, the upper base plate and the lower base plate are installed at the upper and lower ends of the worm gear. Wherein the thrust bearing at the upper end of the turbine is installed on the through cover, the upper base plate is installed between the thrust bearing and the upper end of the turbine, the thrust bearing at the lower end of the turbine is installed on the turbine worm box, and the lower base plate is installed between the thrust bearing and the lower end faceof the turbine. The pressing device solves the problem that the end face of the turbine is abraded, frequent damage of the pressing device is avoided, the spare part consumption and the labor amountof maintenance personnel are reduced, and smooth production is guaranteed. The design is reasonable, the cost is reduced, the service life of parts is prolonged, and large-scale popularization and application are easy.