Reverse-forward rhythmic treatment system for rural domestic sewage

The invention relates to an reverse-forward rhythmic treatment system for rural domestic sewage. The system comprises a water storage module, a reverse osmosis module and a forward osmosis module; a water storage cavity, a first water inlet and a first water outlet lower than the first water inlet are formed in the water storage module; a reverse osmosis cavity, a second water inlet and a second water outlet are arranged in the reverse osmosis module, wherein the second water inlet is communicated with the first water outlet and has the same height as the first water outlet, the second water outlet is lower than or flush with the second water inlet; a forward osmosis cavity, a third water inlet which is communicated with the second water outlet and is the same as the second water outlet in height, and a third water outlet lower than or equal to the third water inlet in height are arranged in the forward osmosis module; a reverse osmosis structure is arranged in the reverse osmosis cavity and comprises a multi