Large-size infrared zinc selenide lens low-temperature detection device and test method

The invention discloses a large-size infrared zinc selenide lens low-temperature detection device and a test method, the large-size infrared zinc selenide lens low-temperature detection device comprises an interferometer, a vacuum tank, a test tool, an infrared lens group, a collimator and a sealed transparent window, the collimator is connected with the vacuum tank, the test tool is connected in the vacuum tank, the infrared lens group is detachably connected with the test tool, and the sealed transparent window is connected with the infrared lens group. The infrared lens assembly is aligned with the axis of the collimator, the collimator is aligned with one side of the small-hole diaphragm through the sealing ring window, the other side of the small-hole diaphragm is aligned with the interferometer, and the small-hole diaphragm is fixedly connected with the light source platform. An interferometer, a collimator, a vacuum tank, an infrared lens assembly, a low-expansion testing tool, an objective table, a qu