Planetary lander propulsion system passivation device and method

The invention provides a planetary lander propulsion system passivation device and method. The planetary lander propulsion system passivation device comprises a gas cylinder, a gas circuit electric explosion valve, a pressure reducing valve, a passivation electric explosion valve, an oxygen diaphragm type storage tank, a combustion diaphragm type storage tank, a pressure sensor and a passivation engine. The gas cylinder is connected with the passivation engine through a pipeline, and the gas circuit electric explosion valve, the pressure reducing valve, the oxygen diaphragm type storage tank and the combustion diaphragm type storage tank are sequentially arranged on the pipeline; the passivation engine is used for ignition when a propellant is passivated; the oxygen diaphragm type storage tank and the combustion diaphragm type storage tank are arranged in parallel; diaphragms are arranged in the oxygen diaphragm type storage tank and the combustion diaphragm type storage tank and used for separating gas and l