Aiming at the problem of insufficient disturbance suppression capability in the current photoelectric stabilized platform servo system, a disturbance separation active disturbance rejection control (DSADRC) algorithm was proposed. The active disturbance rejection control method based on disturbance separation took full use of part of the known photoelectric stabilized platform model information and controller information in classical control that could be obtained in engineering practice, and added it to the design of active disturbance rejection control. This algorithm increased the disturbance observation accuracy and disturbance suppression of the system ability by reducing the total disturbance in the photoelectric stabilized platform system. At the same time, through proposed algorithm design, the reuse of classic controllers was realized and the design workload was reduced. The simulation results show that under the same controller and the same disturbance conditions, the step response settling time of the DSADRC is reduced by 58.8%, the rise time is reduced by 26.5%, and there is no overshoot; under the 1V2Hz equivalent disturbance, the system steady accuracy is increased by 51.5%, and the system performance is improved obviously. In the physical verification experiment, for equivalent disturbances of different frequencies, compared with PID control, the steady accuracy of the DSADRC is improved by more than 50%, which effectively improves the steady accuracy of the photoelectric stabilized platform.