Abstract: Aiming at the problems of poor operation flexibility, easy wear and high maintenance cost caused by the copper strip limit adopted in the existing roll saddle of Sendzimir rolling mill, a structural optimization scheme based on roller assembly is proposed. By arranging evenly distributed cylindrical holes on the side wall of the eccentric disc, the optimized roll saddle is internally equipped with a roller assembly composed of pin shafts, deep groove ball bearings and springs, which realizes the replacement of traditional sliding friction with rolling friction between the eccentric disc and the support ring. Structural design, parameter optimization and performance tests show that the rotational friction torque of the eccentric disc of the optimized roll saddle is reduced by more than 60%, the axial positioning accuracy is improved to the 0.01 mm level, the maintenance cycle is extended by 3 times, and the processing qualification rate is increased from the original 75% to 98%. The optimization scheme effectively solves the core defects of the traditional structure, and provides a feasible way for the design and upgrading of roll system supporting parts of high-precision rolling mills.