During the operation of the maglev linear synchronous motor, due to the different height of suspension and the resistance change caused by the armature loop current, the system has the problem of parameter perturbation. A method for H∞ control of parameter uncertainty system of the linear synchronous motor is proposed. First, the structure and operation mechanism of the linear synchronous motor are analyzed, and the mathematical model of the parameter uncertainty feed control system is established. Second, the uncertainty of the control system and the interference suppression of the parameters are reduced to the standard H∞ state feedback design. By acquiring the positive definite solution of Riccati inequality, the H ∞ robust controller of the feed subsystem of the parameter uncertainty control system is obtained. Finally, MATLAB/Simulink simulation results show that the system has better performance than PI control when there are parameter uncertainties and external disturbances, and the requirements for the control system of maglev linear synchronous motor for CNC machine tool can be met.