Molten salt heat storage solar thermal power generation system

The invention discloses a molten salt heat storage solar thermal power generation system. The system comprises a heat collecting subsystem, a heat storage subsystem, a steam generation subsystem and a power generation subsystem connected in sequence; the heat collecting subsystem is connected with the heat storage subsystem; the heat storage subsystem is connected with the steam generation subsystem; and the steam generation subsystem is connected with the power generation subsystem. As the connecting relation of the steam generation subsystem to the heat collecting subsystem and the heat storage subsystem is improved, the power load output stability of the power generation subsystem is improved; and the power load output by the system is not changed along with the change of solar radiation, so that the load fluctuation is largely reduced, and the whole control operability of a power station is promoted.