The embodiment of the disclosure relates to an Unmanned Aerial Vehicle (UAV) terrain simulation flying method and device, and a UAV. The method includes: acquiring a vertical distance between a UAV and the ground; acquiring an oblique distance between the UAV and the ground; acquiring an angle between the vertical distance and the oblique distance; and adjusting a terrain simulation flying state of the UAV according to the angle, the vertical distance and the oblique distance.