The invention discloses a wind tunnel device for continuous high-temperature sealing performance testing. The wind tunnel device is composed of an air compressor, a gas cylinder, a normal-temperaturepressure gauge, a stop valve a, a reducing valve, an air flow meter a, a pipeline type air heater, a stop valve b, a high-temperature thermometer a, high-temperature pressure gauge, a test section, anair flow meter b, and a high-temperature thermometer b. The air compressor pressurizes air and stores the processed air in the gas cylinder; the reducing valve adjusts the pressure; heating is carried out by using the pipeline type air heater; with the test section, a testing piece is fixed in a specific trench of the test section, the distance between an upper cover plate of the test section anda pedestal is changed by replacing adjusting gaskets with different dimensions so as to change the compression amount of the testing piece; and with the high-temperature thermometer a, the high-temperature pressure gauge, the air flow meter b, and the high-temperature thermometer b arranged in front of and in rear of a sealing device, sealing and heat insulating parameters of the testing piece onthe conditions of different compression amounts, different pressure differences, and different temperatures are obtained.