Forward osmosis and reverse osmosis (FO-RO) coupled novel seawater desalination process

The invention discloses a forward osmosis and reverse osmosis (FO-RO) coupled novel seawater desalination process. The process comprises the following steps: 1, a raw material solution (seawater) of an FO system enters an FO3 system from a water flow channel 1 at a speed of 2700L/h through a water pump, and meanwhile, a draw solution (2 Mol/L sodium chloride solution) of the FO system enters a draw solution side of an FO1 system through a flow channel 5; 2, the seawater obtained after FO3 concentration enters the raw material liquid side of FO2 from a flow channel 2, and a sodium chloride solution obtained after FO1 dilution enters the absorbing liquid side of the FO2from a flow channel 6; 3, the seawater obtained after FO2 is further concentrated enters the raw material liquid side of theFO1 system from a flow channel 3, a sodium chloride solution further diluted by the FO2 enters the absorbing liquid side of the FO3, and finally, the seawater concentrated by the FO1 flows out of a flow channel 4, a sodium c