A new type of cab follow-up hydraulic system and universal valve structure is designed to effectively reduce the design and manufacture cost of commercial vehicle’s parts. In addition to satisfying cab overturning working conditions, the new valve also assumes the follow-up function of the hydraulic system instead of the hydraulic cylinder, and the spring parameters in the hydraulic valve can be adjusted according to different environments to improve the versatility of the valve. In order to achieve better performance, the maximum lift force is optimized using newly proposed multi-swarm PSO. In this paper, the cab overturning process model and objective optimization model are established with Matlab software, and the objective function is optimized and solved by improved multi-swarm PSO. The results show that the new cab follow-up hydraulic system and the new valve structure can meet the requirements of various working conditions of the cab well; the maximum lifting force during the cab overturning process was basically consistent with the experimental results; the improved multi-swarm PSO can solve the parameters with fast convergence, and the objective function value is reduced by 85%.