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The flight simulator turntable servo system is an important simulation equipment for missile flight, which is used to obtain experimental data. A nonlinear control method of flight simulation turntable servo system based on differential observer is proposed to solve the problem of parameter uncertainty, nonlinear friction and other uncertainties in the tracking control process of flight simulation turntable servo system; Considering the uncertainty of the system in the tracking control process, a differential observer is designed to estimate the composite uncertain disturbance; A nonlinear controller is designed to control the flight simulation turntable servo system, so that the system can converge to the desired position and angle signal; The robustness of the controller under system conditions is proved by Lyapunov stability; Through MATLAB/Simulink simulation test platform, it is verified that the control strategy proposed in this paper can make the system effectively track the desired position angle, which has certain engineering application value;