Obstacle detection technology based on ultrawideband life detection radar has broad application prospects in the field of noninvasive detection such as disaster relief and antiterrorism operations. At present, most of the researches at home and abroad are using single point of view radar to detect the target, and it is difficult to detect the position of the body in the condition of low SNR. In view of the limitation of the above methods, this paper uses the multiple observation points to put the radar, and the echo signal is detected by correlation, and the spatial position of the body is obtained. The simulation results show the superiority of the proposed method in low SNR conditions. The experimental results show that the proposed method is feasible and can detect the location of life.