As a modern means of transportation, the maglev train has a non-linear and unstable levitation system. According to the characteristics of the system, the stability problem is researched and discussed. According to the mechanical structure of the suspension track, a physical model of the suspension system with nonlinear properties is established. In order to facilitate understanding and research, the nonlinear system is linearized by the feedback linearization method of the inverse system, and the pseudo-linear system equation of the rail train suspension system after compensation will be obtained. Analyze the characteristics of the pseudo-linear system and design a closed-loop simple and robust controller. Use the Simulink toolbox in MATLAB software to simulate the control system. The simulation results show that the train suspension system under the action of the controller has strong robustness and good suspension stability. It has strong immunity to external interference and can better meet the requirements of stable suspension control.