The invention relates to a thermal storage-electricity generation-propulsion integrated solar thermal propulsion system. The system comprises a secondary condenser, an energy extractor, a heat absorption cavity, a thermal storage cavity, a porous heat absorption channel, a thermal insulation layer, a spraying pipe, a vacuum cavity and a thermal photovoltaic system, wherein the thermal storage cavity is of a closed cavity structure, the heat absorption cavity is embedded into the thermal storage cavity, the energy extractor is embedded into the heat absorption cavity, the energy extractor is connected with the front end face of the secondary condenser, the rear end face of the secondary condenser is located outside the thermal insulation layer, the secondary condenser is of a cone frustum structure coaxial with the thermal storage cavity, the vacuum cavity wraps the outer side of the rear end face of the side wall of the thermal storage cavity, the porous heat absorption channel wraps the heat absorption cavity, the front end face of the porous heat absorption channel is communicated with the spraying pipe, and the thermal photovoltaic system comprises a cooling channel and a heat pipe. Hydrogen can be adopted as a working medium, under the design working condition, specific impulse being 730s and thrust being 0.9 N can be generated, the electric generating capacity is 10-40 W,electric supply can continue to be supplied to the eclipse region, and the proper specific impulse and thrust are obtained.