As a crucial control and protection element in the power system, the performance of the actuator of a high-voltage switch directly determines the core performance indexes of the switch, such as the opening and closing speed and simultaneity, and thus has a key impact on the safe and stable operation of the power system. As the core component of spring-operated actuator of high-voltage switch, the cam’s contour curve directly determines the mechanical characteristics of the actuator. This paper establishes a high-precision simulation model of the actuator mechanism in multi-body dynamics simulation software, and outputs the dynamics curves and parameters under different structural parameters of the cam base circle radius to analyze the changing law of the kinematic characteristics of the actuator mechanism under different structural parameters, including the closing stroke curve, the closing speed, the average speed of the closing and the standard deviation of the closing acceleration, which provides the key for the optimization of the cam of the actuator mechanism. It provides key theoretical guidance and simulation data support for the optimization of operating mechanism cam.