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Considering the carrier-based aircraft affected by various carrier air wake in the final landing stage. Therefore, in order to improve the robustness of the control system of the carrier-based aircraft, L1 adaptive control based automatic landing control law is proposed in the paper. Frist, converting the carrier air wake into disturbance model of the control system and constructing the L1 adaptive control law structure by analyzing the characteristic of carrier air wake. Second, based on the L1 adaptive control method, the longitudinal automatic landing control law is designed, including state observer, L1 adaptive control law, low-pass filter and adaptive law, and the stability of designed control system is analyzed. Last, the influence of the carrier air wake at different scales on t the automatic landing system is discussed, and One-factor Analysis of Variance (One-way ANOVA) analysis method is used to analyze the landing point under different carrier air wakes. The simulation results show that the carrier air wakes at different wind speeds has a certain influence on the accuracy of landing and the designed automatic landing control law based on L1 adaptive control method has strong adaptability and anti-interference ability.