The invention discloses a method for testing the fire extinguishing efficiency of high-pressure fine water mist of a hangar. The method comprises the following steps that 1, aviation kerosene is injected into a test oil pan of an experimental device, a test plate is arranged above the test oil pan, meanwhile, a temperature detector is fixed on the upper side surface of the test plate, a thermal density detector is fixed on the lower side surface of the test plate, and an anemometer is arranged to test the current air speed; 2, the aviation kerosene is ignited through an ignition rod, a personuses a chronograph to record time from the moment when the kerosene is ignited in the position 10m away from the fire scene, a non-paper recorder starts to record temperature output by the temperaturedetector, and the heat flux density output by the thermal density detector; and 3, when flame is completely extinguished, the chronograph stops, and and is left to stand for a period of time. According to the method for testing the fire extinguishing efficiency of high-pressure fine water mist of the hangar, through the arrangement of the step 1 and the step 2, the temperature condition of the test plate above the aviation kerosene in the burning process can be effectively measured.