In order to further improve the position accuracy of the deformed blank round plate from the centering mechanism to the center of the hydraulic press, a main and auxiliary sucker manipulators for positioning by the main sucker and auxiliary grasping by the auxiliary sucker was proposed. By the composition and working principle of the feeding system，applying simulation and calculation methods, the deformation displacement of the main sucker and the main and auxiliary sucker on the round plate was analyzed. The main and auxiliary sucker manipulator was designed to suck and hoist the deformed blank round plate within the diameter range of 1 200~3 900 mm, which reduced the influence of welding stress deformation and deformation displacement after suction, and improved the positioning accuracy from the centering mechanism to the center of the hydraulic press. The practical application shows that the main and auxiliary sucker manipulator realizes the high-precision and stable handling of the blank round plate with a wide range of diameter, up to 100 mm deformation and a maximum load of 2 000 kg. The positioning accuracy is controlled from 1 mm to 4 mm, which further improves the product quality and system safety. The stacking quantity on the round plate blank trolley is recommended, which meets the actual needs of application and production.