The invention discloses a high-pressure water mist fire extinguishing experimental device for hangars. The device comprises a test oil receiver, a rack, a spray head and a water outlet device; a temperature detector and a heat density detector are arranged on the upper side, relative to the test oil receiver, of the rack; the temperature detector and the heat density detector respectively detect temperature and heat density data and output the data into an external computer; the upper side, relative to the test oil receiver, of the rack is fixedly connected with a test plate; the temperature detector is fixed on the upper side surface of the test plate; the heat density detector is fixed on the lower side surface of the test plate; the upper side surface, close to the middle part, of the test plate is fixedly connected with a spray head bracket; a telescopic tube is arranged on the spray head bracket; and the spray head is fixed at the lower end of the telescopic tube. According to thehigh-pressure water mist fire extinguishing experimental device for hangars, the test plate, the temperature detector and the heat density detector are set to effectively detect the temperature condition on the upper side in the oil combustion process.