NOVELTY - A tide unsteady state pressure sea water desalting and generating device comprises a seawater pre-processing device, a booster pump inlet pipeline, channel plates, a water turbine, a shaft joint, a rotating shaft, a cylinder body, n adjustable swash plate, homogeneous spring, diameter-variable plunger piston, booster pump outlet pipeline, a fresh inlet overflow valve, a non-steady state reverse osmosis membrane, a high pressure brine pipe, liquid flow battery, brine discharging pipe, an engine room, a controller, a flow rate adjusting component, a brake device, and a supporting device.    USE - A tide unsteady state pressure sea water desalting and generating device.    ADVANTAGE - The device reduces concentration polarization of the reverse osmosis membrane, and is clean.    DETAILED DESCRIPTION - A tide unsteady state pressure sea water desalting and generating device comprises a seawater inlet, a seawater pre-processing device, a booster pump inlet pipeline, channel plates, a water turbine, a shaft joint, a rotating shaft, a cylinder body, a booster pump bearing, an adjustable swash plate, homogeneous spring, diameter-variable plunger piston, booster pump outlet pipeline, a fresh inlet overflow valve, a non-steady state reverse osmosis membrane, a fresh water pipeline, a high pressure brine pipe, a fresh water outlet overflow valve, liquid flow battery, brine discharging pipe, a sealing component, an engine room, a controller, a flow rate adjusting component, a brake device, and a supporting device. The non-uniform cylinder body is provided with a plunger cylinder. The non uniform cylinder body is rigidly connected to form a coaxial rotating by the booster pump bearing support. Pressurizing pump outlet pipe is connected with the non-steady state reverse osmosis membrane through thin opening overflow valve. The non-steady state reverse osmosis membrane is connected with the liquid flow battery by high pressure brine pipe and fresh water outlet overflow valve. The booster pump inlet pipeline is connected to channel plates and sea water pre-treating device. The controller adopts cable connected with the liquid flow battery, the brake device, the flow rate adjusting component. The whole device is set with the sea tide flow rate through the support device with high sea area, comprising seat bonnet structure.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating the tide unsteady state pressure sea water desalting and generating device.