The present invention is fixed to the bottom of the wall or the bottom of the vertical frame is formed with an opening through which water can flow in the event of flooding, a pair of fixing brackets and plate shape each formed with a sliding groove on the inner side facing each other sliding in the sliding groove It is inserted into the, and relates to a water-repellent water-order device including a water-sealing plate having an airtight member of a flexible material in the longitudinal direction to prevent the inflow of water. According to the present invention, since only the fixing brackets need to be fixed around the outer wall or the outer window, which is already installed, it is possible to easily install the apparatus for preventing flooding after the external wall or the outer window if necessary.
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