Abstract: In order to improve the performance of the magnetic levitation platform control system of NC machine tool driven by electrically excited linear motors (EELM), a nonlinear adaptive backstepping control method is proposed. The structure and operation mechanism of EELM are studied. The stator of EELM is composed of iron core and excitation winding, and the mover is composed of iron core and armature winding. It is fixedly connected with the feed platform of NC machine tool to drive the movement of the platform. The suspension of the platform is realized by the suspension of the excitation magnetic field on the unilateral magnetic pulling platform of the mover iron core; The mathematical model and state equation of the control system of the EELM maglev platform are established; For the uncertain disturbance existing in the operation of the magnetic levitation platform of electrically excited linear motor, The unknown disturbance is estimated by designing a nonlinear adaptive backstepping controller,and the Lyapunov theory is used to verify the stability of the system. The computer simulation of the control system is carried out with MATLAB/Simulink to verify the effectiveness of the proposed method.