The utility model relates to a four-rotor-wing unmanned aerial vehicle for eliminating high-altitude combustible foreign bodies. A fixed frame with counter weight, a flaming device, a wireless remote control device and a video collecting and transmitting device are fixed on a fuselage of the four-rotor-wing unmanned aerial vehicle, wherein the flaming device consists of a butane storage tank, a jetting duct and a nozzle; the wireless remote control device consists of a wireless remote control receiver, an ignitor, and an electric switch valve for an outlet of the butane storage tank, and the wireless remote control receiver is electrically connected with the ignitor and the switch valve; the video collecting and transmitting device consists of a camera and a wireless launcher, wherein the wireless launcher transmits collected video images to a display screen of a ground receiving system or a pair of video glasses. Compared with the prior art, the four-rotor-wing unmanned aerial vehicle unmanned aerial vehicle disclosed by the utility model has the benefits that the unmanned aerial vehicle is used for carrying the flaming device to reach a defect point to perform flaming so as to eliminate the combustible foreign bodies; the unmanned aerial vehicle has the characteristics that the efficiency of removing the hidden risk of accidents is high, the elimination is clean and thorough, the operation is easy and the like, the labor intensity of staff can be alleviated to a great extent, and the personal safety is guaranteed.