The invention discloses a household off-grid photovoltaic power generation system which includes a photovoltaic assembly, a solar controller, a storage battery and an AC control module. The photovoltaic assembly, the solar controller, the storage battery and the AC control module are sequentially connected. The solar controller is connected with a DC load. The AC control module is connected with the AC load and a mains supply. The photovoltaic assembly receives optical radiation energy in sunlight and converts the energy into electrical energy which is then stored into the storage battery through the solar controller. The solar controller obtains the electrical energy on the storage battery so as to supply power directly to a DC load. The AC control module converts DC of the storage battery into 220V AC to supply power to the AC load on one hand, and on the other hand, controls switching between power supplying of the mains supply and power supplying of the storage battery so that a photovoltaic power generation technology can be applied to most households in our country and a back-up power supply can be provided after power-off.