The invention relates to a calibrating device for space thermal-
optical testing. The device can be used for detecting a defocusing amount of a parallel
light tube with a large calibre in a thermal-
optical test and belongs to the field of photoelectric detection. Aiming at the problems that the defocusing of the parallel
light tube causes that the detection precision is reduced and
system errors are increased when an optical remote sensor is used for carrying out the thermal-
optical test, the invention designs the thermal-
optical test calibrating device, which can detect the defocusing amount of the parallel
light tube in real time. The thermal-optical test calibrating device is small in optical shielding, high in detection precision, good in instantaneity and good in reliability and has very high practicability.