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In view of the fact that the existing UAV aviation emergency mapping system can not be applied to the surface feature emergency mapping, and can not meet the practical application requirements of UAV aviation large-scale mapping, an UAV aviation emergency mapping system based on Improved SIFT algorithm is designed. According to the performance difference of different fixed wing UAV products, the integrated connection relationship among sensors, engines, UAV platform and other hardware structures is analyzed, the integrated design scheme of emergency mapping system is proposed, and the hardware design of the system is completed. Based on the application principle of SIFT algorithm, combined with brisk descriptors, the Improved SIFT algorithm is used to match the relevant mapping feature points, and then combined with the known improvement direction of SIFT algorithm, the basic process of mapping disposal is improved, and the system software integration design is realized. The experimental results show that the maximum frequency of video data, optical image and SAR data is 7.06hz, and the maximum space frequency time is 0.03. Compared with CH-4 aviation emergency mapping system, the data obtained by the system can fully meet the practical application requirements of large-scale aerial mapping, and is suitable for the surface features of aerial photography, and it provides an effective emergency mapping support.