Provided are an unmanned aerial vehicle control method, an unmanned aerial vehicle system, and a control device. The method comprises: acquiring a rolling instruction, wherein the rolling instructionis used for controlling the unmanned aerial vehicle so that same rolls in a first rolling direction; according to the rolling instruction, when the upward flight speed of the unmanned aerial vehicle is greater than or equal to a pre-set speed, controlling the unmanned aerial vehicle so that same accelerates the rolling in the first rolling direction; controlling the unmanned aerial vehicle so thatsame decelerates the rolling in the first rolling direction; and when the unmanned aerial vehicle rolls one circle in the first rolling direction, controlling the unmanned aerial vehicle so that samestops rolling. According to the present embodiments, when the upward flight speed of an unmanned aerial vehicle is greater than or equal to a pre-set speed, the unmanned aerial vehicle is controlledso that same accelerates rolling, and therefore, the unmanned aerial vehicle firstly flies upwards for a distance, and the upward flight distance offsets the distance by which the unmanned aerial vehicle flies downwards during a rolling process, so that the change in the altitude direction after the unmanned aerial vehicle rolls one circle is not substantial, thereby avoiding the phenomenon of altitude drop.