Abstract: In response to the problem of large fluctuations in the feeding accuracy of the servo feeder on the flexible production line for metal cold bending, this article analyzes the working principle of the servo feeder's hydraulic system and the force conditions of the feeder's cylinder and feed roller based on the working requirements of the servo feeder, identifies the problems in the hydraulic system, and optimizes the working principle of the hydraulic system.The feeding accuracy of the servo feeder under two hydraulic systems was measured separately, verifying the rationality of the optimized hydraulic system.