When the UAV performs target tracking, there is a high demand on the real-time performance of the algorithm in the process of obtaining the distance between the UAV and the target.In consideration of the demand, a binocular stereoscopic vision ranging method based on the combination of Matlab toolbox and OpenCV vision library is proposed.The method uses the Matlab toolbox to perform binocular calibration on the camera, and then imports the calibration result into the OpenCV-based stereo matching BM algorithm for subse-quent ranging processing.Through experiments, it is verified that the proposed method has high accuracy and excellent real-time performance, which can meet the ranging requirements of UAV dynamic tracking.