Fixed wing UAV autonomous landing guidance system needs high precision, fast tracking speed. This paper designed and built a set of infrared vision based UAV automatic landing guidance systems. Firstly the visual landing guidance system principle, composition, and analysis of the mathematical model is introduced; And the visual identification logo,the guidance system image processing algorithm and the visual tracking algorithm, visual landing guidance control structure has been desingned. Finally, the reliability, tracking speed and precision of the system were verified by field experiments. The experimental results showed that the designed landing guidance system could meet the requirements of the precise autonomous landing of a fixed wing UAV.