Ultra-high-rise building fire extinguishing system and fire extinguishing method

The invention discloses an ultra-high-rise building fire extinguishing system and fire extinguishing method. The fire extinguishing system comprises a compressed air foam generating device used for generating compressed air foam, a fire fighting water tank used for providing a water source for the compressed air foam generating device, a foam liquid tank used for providing a foam stock solution for the compressed air foam generating device, a pipeline system used for conveying the compressed air foam, and a compressed air foam fire hydrant tank used for outputting the compressed air foam to extinguish fire. The ultra-high-rise building fire extinguishing system can quickly convey the compressed air foam to any floor of an ultra-high-rise building while providing the high-performance compressed air foam for fire extinguishing of the ultra-high-rise building, and has the advantages of wide conveying range, high fire extinguishing efficiency, low construction cost, simple electrical control system and the like.