An embodiment of the invention discloses a ground object net distance measurement method and device. In the embodiment, a first target aerial image and a second target aerial image shot by an unmanned aerial vehicle as well as POS data information are acquired, and stereopair relative direction elements are obtained according to N pairs of corresponding image points; two to-be-measured ground object points are selected on the first target aerial image and the second target aerial image; the net distance of the two to-be-measured ground object points is determined according to the POS data information and the stereopair relative direction elements. The net distance of the ground objects is determined on the basis of the target aerial images shot by the unmanned aerial vehicle, and the problem that the sight is shielded by the ground objects because of the limited visual measurement range is effectively solved; further, measurement can be realized only by shooting the target aerial images by the unmanned aerial vehicle and performing calculation, so that the measurement cost is lower, and the measurement result is more accurate.