The invention relates to an unmanned aerial vehicle and an unmanned aerial vehicle terrain simulation flying method and device. Theunmanned aerial vehicle terrain simulation flying method comprises the following steps of: obtaining the vertical distance between the unmanned aerial vehicle and the ground; obtaining the oblique distance between the unmanned aerial vehicle and the ground; obtaining an included angle between the vertical distance and the oblique distance; and adjusting the terrain simulation flying state of the unmanned aerial vehicle according to the included angle, the vertical distance and the oblique distance. The unmanned aerial vehicle of the embodiment has the beneficial effects that the unmanned aerial vehicle can be controlled to make different flying movements according to different oblique distances between the unmanned aerial vehicle and the ground, thereby enabling the unmanned aerial vehicle to fly by simulating the terrain in various environments such as mountainous regions, hills, terraced fields, plains and high-stalk plants; the operation efficiency of the unmanned aerial vehicle and the ability of the unmanned aerial vehicle to adapt to environments are improved; and the reliability and safety of the unmanned aerial vehicle are improved.