The invention discloses an auxiliary charging system for an unmanned aerial vehicle. The auxiliary charging system for the unmanned aerial vehicle includes a charging station management module, an unmanned aerial vehicle information library, an alarming module, a man-machine interaction module, a control device, an information transmission module, an unmanned aerial vehicle controller, an action control module, an image collection module, an image processing module, an ultrasonic height gauge, an individual information library, a GPS positioning module, a power supply and an electric quantitymeasuring module. According to the auxiliary charging system for the unmanned aerial vehicle, by analyzing the relations between the electric quantity and the flight distance of the unmanned aerial vehicle, according to the actual condition of the unmanned aerial vehicle and the distance between the unmanned aerial vehicle and charging stations, the unmanned aerial vehicle is allotted to the mostappropriate charging station to be charged so that the unmanned aerial vehicle can fully utilize the battery capacity, and the single flight time of the unmanned aerial vehicle is prolonged; a descending process is started when the drone is located at the position a certain distance away from the charging stations, landing is conducted through accelerated descending and decelerated descending, therefore, much landing time is saved, and the work efficiency of the unmanned aerial vehicle is improved.