Abstract: Aiming at the fast and slow shearing problem of blanking scissors in the flexible production line of metal cold bending, this paper designs a high-low-pressure, fast and slow hydraulic system with safety protection function according to the working requirements of blanking scissors. In this paper, the working principle of the split blanking scissors and the action requirements of the hydraulic system are described in detail. A double-loop hydraulic system is designed, the working principle of the hydraulic system is expounded, the parameters of each component of the hydraulic system are calculated, the shearing action test is carried out, and the actual working data of the system are measured, which verifies the design principle of the system and the rationality of the selection of each component.