Method for actively regulating mixture ratio of spacecraft propellant

A method for actively regulating mixture ratio of a spacecraft propellant comprises the following steps: conducting trial run before installing an engine with high consumption into a spacecraft propelling system, determining working parameters, and reaching a standard mixture ratio of an oxidant to fuel at a standard inlet pressure by regulating system hardware; arranging a pressure sensor at an oxidant and fuel inlet, and arranging a self-locking gas supply valve on pressurizing pipelines at the upstream of an oxidant storage tank and a fuel storage tank respectively; and in the working process of the engine, acquiring pressure parameters of the fuel and the oxidant at the inlet of the engine in real time through a propelling system controller, and comparing and regulating the pressure parameters to control the pressures of the two propellants at the inlet of the engine to be very close, so that the deviation level of the total mixture ratio of the propellant can be controlled. By the method, the utilization ratio of the propellant of the spacecraft propelling system is effectively improved, so that the service life of a spacecraft is prolonged, the effective load mass of the spacecraft is improved and the production cost of the spacecraft is reduced.