The invention relates to a test device used for testing the infrared detection sensitivity of airborne photoelectric products in a wide temperature range. The test device adopts a double blackbody configuration, combines with a reflective target to realize infrared radiation target and uniform background simulation, and can accurately control a radiation temperature difference between a target anda background, thus completing an infrared detection sensitivity test under wide temperature range (-55 EDG C-70 DEG C) environmental conditions. The test device is easy to operate, is portable, controls radiation temperature difference accuracy within 0.1 DEG C, and exhibits environmental adaptability to meet the requirements of airborne photovoltaic products delivery.