Vacuum leak detection method of liquid medium for space navigation

The invention discloses an astronavigation liquid medium vacuum leak detection method, which comprises a calibration system, a leak rate test system, a standard leak hole and an auxiliary air exhaust system, and is characterized in that the calibration system and the leak rate test system respectively comprise a first mechanical pump, a first electromagnetic valve, a vacuum gate valve, a first vacuum gauge and a quadrupole mass spectrometer; the calibration system further comprises a preceding-stage molecular pump, a main molecular pump, a pressure stabilizing chamber, a small air exhaust hole I and a calibration chamber; the leak rate test system also comprises a molecular pump 1, a vacuum container and a tested product. The standard leak hole comprises a hand valve I, a small air exhaust hole II, a hand valve II, a vacuum gauge II, a hand valve III, a working medium container and a hand valve IV; the auxiliary air exhaust system comprises a second molecular pump, a second electromagnetic valve and a second