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Aiming at the problem that the traditional UAV attitude robust control system is susceptible to external interference and cannot precisely control the attitude angle, the left rudder surface angle and the right rudder surface angle, resulting in system instability, a back-step sliding mode algorithm is designed. Robust control system for UAV attitude. Use the cascade PID controller of the TMS320F28335 chip to control the UAV central processing unit. Choose the MS-S3 servo driver to weaken the impact generated by the main circuit startup and obtain DC power. Use STM32f407VGT6 attitude controller to control the rotor attitude. Construct the UAV dynamic model, design the anti-step sliding mode control steps, and realize the robust control of the UAV attitude with the help of Visual c++ 6.0. It can be seen from the experimental results that the system's attitude angle, left rudder surface angle and right rudder surface angle are consistent with the actual control results and have precise control effects.