In order to solve the problem that the disturbance torque generated in the loading process of a gun load simulator platform seriously disturbs the stability and loading accuracy of the system, a control method based on active disturbance rejection control (ADRC) is proposed. The “total disturbance” is estimated by the “extended observer” and the feedback compensation is carried out, so as to realize the good anti-interference ability of the system and reduce the dependence of the system on the accurate system model; the ADRC controller is designed, the control system and simulation model are established, and the Matlab/Simulink simulation is carried out. The simulation results show that the control system is feasible for the electric load simulator.