The invention discloses a method and a system for enabling an unmanned aerial vehicle to supervise a parking lot. The method comprises the following steps: parking lot state changes in an area are monitored through a vehicle recognition device, and when the parking lot state is changed, the parking lot information and the corresponding parking lot state change information are sent to a control center; and according to the parking lot information and the corresponding parking lot state change information, the control center controls the unmanned aerial vehicle to photograph the parking lot with the changed state. The method and the system of the invention have the beneficial effects that the system is convenient to mount, and no extremely strict mounting position requirements exist; the method is convenient to operate, all parking lots in the flying area of the unmanned aerial vehicle can be monitored as long as one intelligent photographing device is arranged on the unmanned aerial vehicle, the phenomenon that an intelligent camera is independently arranged in each parking lot for recognizing the vehicle license plate information or the vehicle color information of a vehicle parking in the parking lot is not needed, use of devices is reduced, the whole process is fully automatic, manual intervention is not needed, and errors caused by manual judgment mistakes can be avoided.