Seawater desalination reverse osmosis device based on manual reversing valve

The utility model relates to a seawater desalination reverse osmosis device based on a manual reversing valve. The device comprises a handle, an integrated micro energy recovery module, a reverse osmosis membrane module, a pretreatment module and a liquid path system. The integrated miniature energy recovery module comprises a double-plunger pump, a one-way valve set and a reversing valve. And the double-plunger pump is connected with the reversing valve through a handle and a hinge. The operation method of the device is characterized in that (1) the double-plunger pump and the reversing valve are driven to jointly switch working positions by applying force once through the handle; (2) the output pressure period of the system is shortened and the work efficiency of the system is improved by using the double-plunger pump; and (3) when the handle applies force every time, the reversing valve moves before the plunger pump, that is, the energy of the reversing valve is recovered firstly, then the plunger pump pre