In order to improve the accuracy and efficiency of water-washing device for insulator,and reduce the labor intensity of operators,according to the composition principle of the flushing system,a set of intelligent water flushing device was designed.The dynamic model of the transmission system and the model of the servo control system were established,the dynamic response of the system was analyzed,and the main factors affecting its dynamic characteristics were found.According to the method of time-varying speed loop gain,the proportional integral derivative (PID) control scheme of the servo system was optimized.Through simulation,the optimized vibration characteristic curve of the system was obtained.The comparison shows that the initial response time of the system is shortened by 19.76%.Finally,it was verified by building an on-site test device.The initial response speed of the system increases by 16.1%,the maximum amplitude reduces by 8.6%,and the fluctuation time shortens by 10.2%.The results show that in the insulator washing process,the optimized control scheme of the time-varying speed loop gain can effectively reduce the vibration amplitude of the intelligent water washing device,shorten the response time of the system,and improve the stability of the system.