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In order to solve the problem of time-consuming and laborious conventional ground detection of propulsion system faults that are prone to faults in long-term on-orbit spacecrafts and unable to envelope all fault modes, a real-time simulation scheme for fault diagnosis of long-term on-orbit propulsion system is proposed, and a real-time test platform for fault diagnosis of long-term on-orbit propulsion system is established. Real-time simulation of long-term on-orbit propulsion system is realized by establishing real-time simulation model of propulsion system. Based on the real-time test platform, the fault diagnosis strategy of propulsion system is simulated and optimized, the fault of on-orbit aircraft is diagnosed, and the disposal plan is verified to support the fault disposal decision. The real-time test platform for fault diagnosis of long-term on-orbit propulsion system effectively shortens the optimization iteration period of on-board fault diagnosis strategy, and saves a large amount of funds originally used for fire tests.