Fuel injector sealing ring reliability testing device and method

The invention discloses a fuel injector sealing ring reliability testing device and a method. The fuel injector sealing ring reliability testing device comprises a pair of pressing plates, a fuel injector simulation piece provided with a shoulder, and a sealing ring provided with a step mounting face, a thrust surface and a mounting hole. The method of the invention comprises a step of cold-hot alternating test and a step of high-temperature vibration durability test. By using optimized and simplified design, high-temperature vibration and high low-temperature harsh environment conditions in complicated working conditions after the fuel injector and the sealing ring are arranged on an engine valve chamber can be effectively simulated, and the work performance adaptability of a test sample in predetermined high-temperature vibration and high low-temperature conditions can be checked.