The invention discloses an unmanned-aerial-vehicle airborne tree-barrier clipping device, and belongs to the field of tree clipping. The unmanned-aerial-vehicle airborne tree-barrier clipping device comprises a multi-rotary-wing unmanned aerial vehicle, a power system, a control system, an insulation supporting rod, a transmission shaft, a reversing transmission device, an unmanned-aerial-vehicleconnecting frame and a cutter bit; the power system is fixedly arranged at one end of the insulation supporting rod, the reversing transmission device is fixedly arranged at the other end of the insulation supporting rod, the multi-rotary-wing unmanned aerial vehicle is fixed to the end, close to the power system, of the insulation supporting rod through the unmanned-aerial-vehicle connecting frame, a multi-rotary-wing unmanned aerial vehicle support is arranged on the multi-rotary-wing unmanned aerial vehicle, the transmission shaft penetrates through the insulation supporting rod, one end ofthe transmission shaft is connected with the power system, the other end of the transmission shaft is connected with the reversing transmission device, the cutter bit is connected below the reversingtransmission device, the control system is electrically connected with the power system, and the power system is also sued for driving the multi-rotary-wing unmanned aerial vehicle. The multi-rotary-wing unmanned aerial vehicle carries a custom electric saw to reach a high-altitude tree-barrier position, the power system drives the cutter bit to rapidly remove tree barriers or clip ultrahigh trees.