Permanent magnet linear synchronous motor (PMLSM) has attracted much attention because of its high speed and high dynamic response. The uncertain factors such as parameter change, end effect and friction force will reduce the control system performance of PMLSM. In order to improve the robustness of the system, a plug-in integral sliding mode control is proposed. The output of the original controller is added to the designed sliding surface in the sliding mode control, which makes the control system obtain strong robustness without changing the structure and performance of the original controller. At the same time, the continuous super-twisting control is used to replace the original discontinuous part in the integral sliding mode control, which weakens the inherent chattering in the sliding mode. The MATLAB/Simulink simulation results verify the effectiveness of the proposed method.