In order to solve the input saturation problem in the optoelectronic servo platform, a sliding mode control algorithm based on the transition process is adopted. The transition process algorithm is designed based on the time-optimal theory, which makes the hopping input signal become a slowly rising signal, so that the initial tracking error of the system is decrease, thus avoiding the input saturation phenomenon and greatly improving the system stability. After theoretical analysis and experimental verification, the results show that the proposed method can effectively eliminate the input saturation phenomenon and is suitable for target tracking of the optoelectronic servo platform and has important research and application value.