For the tracking problem of pure time-delay systems, a discrete sliding mode predictive controller is designed. By introducing a prediction model to estimate the future output, the control error caused by time lag is eliminated. Design the sliding mode surface with the estimated output, calculate the corresponding sliding mode control law, and carry out the tracking control simulation experiment for a certain time-delay system. The results show that the controller can effectively overcome the time lag and has good tracking and anti-jamming capabilities.