NOVELTY - A bi-directional tidal energy driven seawater desalinating and power-generating device comprises an impounding water reservoir (102) having water inlet and outlet pipes, each having electromagnetic valve. First and second turbines are respectively set on the water inlet and outlet pipe of the water reservoir. A transmission box has two groups of input end of the driving gear, where each has power input shaft connected with the power output shaft of turbines. The power input shaft of the gearbox (111) is connected with the power output shaft of the transmission box.    USE - Bi-directional tidal energy driven seawater desalinating and power-generating device.    ADVANTAGE - The power generating device utilizes tidal energy to produce electricity, thus the process is clean, environment-friendly, helps in sustainable development. Tidal energy is a renewable energy source, thus the operation has low cost.    DETAILED DESCRIPTION - A bi-directional tidal energy driven seawater desalinating and power-generating device comprises an impounding water reservoir (102) having water inlet and outlet pipes, each having electromagnetic valve. First and second turbines are respectively set on the water inlet and outlet pipe of the water reservoir. A transmission box has two groups of input end of the driving gear, where each has power input shaft connected with the power output shaft of turbines. The power input shaft of the gearbox (111) is connected with the power output shaft of the transmission box. A high pressure pump (115) is connected with the seawater inlet. A reverse osmosis (RO) membrane assembly (123) has fresh water outlet and concentrated seawater outlet directed to the sea, where the water inlet of the RO membrane assembly is connected with a high pressure pump also directed to the sea. The power input shaft of the electric generator (134) is connected with the power output shaft and wheel.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the desalinating and power-generating device (Drawing includes non-English language text).    Water reservoir (102)    Gearbox (111)    High pressure pump (115)    Reverse osmosis membrane assembly (123)    Generator (134)