Abstract: Spectral imaging detection technology combines imaging technology and spectral technology, which can provide rich information of the target scene. The multi-spectral imaging detection technology is studied in detail, and multi-spectral camera of unmanned aerial vehicle is designed for the camouflage target reconnaissance. The calculation method of multi-spectral reconnaissance detection and recognition is analyzed emphatically. Experimental results show that the efficiency of multi-spectral reconnaissance performance is improved by 20%~50%.