Water intake system of sea water

The invention relates to a seawater getting system, which comprises a vertical well dug downwards from the ground surface, a pipeline tunnel communicating with the vertical well to an adjacent ocean, a water duct one end of which protrudes into the ocean so as to get water is arranged in the pipeline tunnel, as well as a control valve arranged on the water duct. On one hand, the pipeline tunnel can prevent the water duct from being easily destroyed as the water duct is directly soaked in seawater, and on the other hand, the pipeline tunnel can provide convenience for personnel to pass in/out for pipeline arrangement, operation or maintenance. In addition, when partial sections of the water duct crack, the partial sections can be selectively closed, by the control valve arranged on the water duct, so the cracks of the pipeline can be maintained at the same time when normal water getting amount can still be maintained.