Abstract: Satellite propellant leak detection is an important procedure in spaceflight launch mission.It ensured security for personnel and product also prevented the occurrence of security incidents.But calibration of test equipment is a difficulty question for long time.The article introduces a kind of comparison equipment of satellite propellant leak detection,including structure principle,acquirement mode of propellant leak simulation source,and comparison method.Finally,diffusivity experiments of hydrazine anhydrous leak simulation source and conclusion of comparison factor testing are gave.