According to the requirement of unmanned combat aerial vehicle (UCAV) autonomous landing, a new guidance and control algorithm is designed. According to the relative motion relationship between UCAV and aircraft carrier, the longitudinal and lateral guidance commands of UCAV landing are derived. Based on the nonlinear dynamic model, the flight control law of UCAV landing is designed. The L1 adaptive compensation controller is designed to suppress the influence of disturbance such as ship wake on the landing performance. The simulation results show that the system can guide the UCAV to land safely, and has a good landing success rate in level 4 sea conditions.