Ultra wideband through wall detection radar is developed by using ultra wideband (UWB) technology. It can detect, locate, track and identify hidden targets behind buildings or obstacles. It has important applications in urban street warfare, anti-terrorism struggle, public security riot prevention, disaster rescue and other fields. At present, the ultra wideband through wall detection radar developed in the laboratory can penetrate non-metallic and low water content walls, such as masonry, wood, and so on. After detecting the wall, the moving human body target can be detected. The detection distance is more than 10 meters, and the range resolution is 7.5 cm.