Reverse osmosis technology (RO) is a use of polymer membrane material dissolution separation process, reverse osmosis equipment to reverse osmosis main parts as the main body, supplemented by multi-stage centrifugal pump, high pressure pipeline control valve, pressure protection device assembly, can effectively intercept the water dissolved salt, small molecule substances, colloids and microorganisms. The desalination with reverse osmosis membrane has higher efficiency and economy than the general ion exchange and distillation method, and can be used for the desalination of pure water, seawater and brackish water in the electronics and pharmaceutical industries.