Abstract: The new electric propulsion technology has the advantages of high specific impulse、small thrust、longevity of service,it well be the main propellant electric propulsion on new space platform.According to the electric propulsion system's leakage of Xenon supply subsystem may be happened in the process of filling Xenon,we developed the equipment of Xenon gas leak detection.This paper introduced the technologies related to equipment structure、technical targets、detection methods,and performance results of the equipment.The test results showed:Xenon gas leak detection equipment technology can fully meet the need of electric propulsion system.