NOVELTY - A bidirectional tidal pressure-driven type seawater desalinating and power generating devices comprises a reservoir (700) provided with a water inlet and outlet pipe, a water turbine (704), a second water turbine (704), a transmission box (736), a gear box (712), a high pressure pump (737), a reverse osmosis membrane component (718), a booster pump (744), the turbine booster pump (724), a generator (729), a storage battery (730) providing power source for electric generator and an electric motor (745).    USE - Complementary voltage type seawater desalinating and power generating device using tidal energy bidirectional driving.    ADVANTAGE - The operation cost of the power generating device is low. Tidal energy is a renewable energy source, provided with capable of continuously development, and has good social benefit and application value.    DETAILED DESCRIPTION - A bidirectional tidal pressure-driven type seawater desalinating and power generating device, comprises: a reservoir (700), provided with a water inlet pipe(705) and a water outlet pipe (706), the water inlet pipe and the water outlet pipe are provided with the first electromagnetic valve (701) and the second electromagnetic valve (732), respectively; a water turbine (703) set on the water storage tank of the water inlet pipe; a second water turbine (704) disposed on the water outlet pipe of the water storage tank; a transmission box (736), provided with two groups of input end of the driving gear (708) and a group of input end of the driven gear (749), the input end of the driven gear is connected with a group of input end of the driving gear or separated from the input end of the driving gear are respectively provided with a power input shaft (750,752), where a power input shaft is connected with a power output shaft of the water turbine; a gear box (712), a power input shaft (711) of the gear box is connected with the power output shaft (709) of the transmission box (736); a high pressure pump (737), the power input shaft (715) is connected with the power output shaft of the gear box, the water inlet (740) of the high pressure pump through-the first signal is connected to the sea water in the sea water or water in the valve and the sea; a reverse osmosis (RO) membrane component (718) is provided with a fresh water outlet (720) and concentrated sea water outlet (721) connected with the water inlet of the high pressure pump; a booster pump (744), and the water inlet (743) is connected with the sea water in the sea water or water in the second one-way valve (742), connected with the sea water outlet is connected with the high pressure pump and is connected with the connecting pipeline of the RO membrane component; the turbine booster pump (724), the water inlet of the RO membrane component and the concentrated sea water outlet is connected with the water outlet (725) is connected with the sea; a generator (729), a power input shaft (728) of the generator is connected with the power output shaft of the turbine; a storage battery (730), providing power source for electric generator; an electric motor (745), a working power supply of the motor by the storage battery, the power output shaft (756) of the motor is connected with the power input shaft (755) of the booster pump.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the tidal pressure-driven type seawater desalinating and power generating device.    Reservoir (700)    Electromagnetic valve (701, 732)    Water turbine (703, 704)    Water inlet pipe of reservoir (705)    Water outlet pipe of reservoir (706)    Input end driving gears (708,735)    Power output shaft of transmission box (709)    Power input shaft of gear box (711)    Gear box (712)    Power input shaft (715)    RO membrane component (718)    Fresh water outlet (720)    Concentrated sea water outlet (721)    Turbine booster pump (724)    Water outlet of turbine (725)    Power input shaft of generator (728)    Generator (729)    Storage battery (730)    Transmission box (736)    High pressure pump (737)    Water inlet of high pressure pump (740)    One-way valve (742)    Water inlet of booster pump (743)    Booster pump (744)    Electric motor (745)    Input end of the driven gear (749)    Power input shaft of driving gears (750,752)    Power input shaft of pump (755)    Power output shaft of motor (756)