Abstract: With the rapid development and application of bionic robots, the measurement method of target information feedback has attracted extensive attention. Currently, most target recognition and ranging methods rely on the installation of assistive devices such as radar or binocular cameras on bionic robots. However, theresources of biomimetic robots are limited, and solutions that are lighter, low-cost, and easy to deploy need to be developed. Therefore, a scheme was proposed to combine the bionic spider with the monocular camera by using characteristics of the bionic spider to adjust its own posture, and achieve the effect of target detection and ranging after processing. In this scheme, the model of YOLOv5 is used to identify the target in the image. The camera was calibrated by MATLAB, the internal and external parameters of the camera were obtained, the image was preprocessed, the stereo matching and the target depth were calculated, and finally the distance between the target and camera in the left attitude of the spider was obtained. Finally, the effectiveness of the scheme is proved by experimental verification.