Leveling is a processing technology for plates with a width of more than1.2m or a length of more than 2.4m. The blanking parts are leveled with special equipment to eliminate the bending, distortion or deformation of the plates during production, transportation or storage. This can ensure the flatness and dimensional accuracy of the punched parts and facilitate the subsequent processing and assembly. Leveling can improve production efficiency and product quality when the width of plate blanking parts exceeds 1.2m or the length exceeds 2.4m.