The perfluoro fire extinguishing device works by triggering through temperature, releasing the fire extinguishing agent, achieving the fire suppression effect through physical cooling combined with chemical inhibition. Physical cooling mainly occurs through heat absorption during liquid temperature rise, vaporization, heat absorption by steam, and high heat capacity mixed gases; chemical inhibition mainly involves absorbing and neutralizing flame free radicals to prevent the combustion chain reaction. The released perfluoro gas forms an gaseous mixture with the air. The heat capacity ratio of this reagent and the air mixture is much larger than that of the individual air. For every one-degree change in temperature, it absorbs more heat. Under an appropriate system design concentration, the perfluoro and air mixture will absorb sufficient heat to disrupt the fire tetrahedron balance. The heat value released in the fire scene will rapidly decrease as the amount of this fire extinguishing agent increases, eventually leading to the cooling of the combustion area and lowering it to the flame-extinguishing temperature point.