The invention discloses a high-altitude fire extinguishing device. The high-altitude fire extinguishing device comprises a fire balloon, a driving umbrella and a fire extinguishing device body. The driving umbrella is hung under the fire balloon and comprises an umbrella body, a power paddle for controlling the driving umbrella to move horizontally, a first control mechanism for controlling the power paddle to rotate, and a connecting piece for fixing the power paddle. The top of the connecting piece is connected with the umbrella body. The fire extinguishing device body comprises a supporting rod, a pulley block installed in the middle of the supporting rod, a first fire extinguishing mechanism and a second fire extinguishing mechanism. The first fire extinguishing mechanism and the second fire extinguishing mechanism are installed at two ends of the supporting rod respectively. The supporting rod is hung under the connecting piece through a plurality of slings. The pulley block comprises a pulley and a pulley seat, and the pulley seat is provided with an arc track matched with the pulley. The pulley is fixed under the middle of the supporting rod. The pulley seat is installed on a fixing seat. The high-altitude fire extinguishing device can extinguish fire at a high altitude without the need of water sources.