The present invention relates to a water advertising buoy to be used as a conventional swimming prohibition line while expecting the advertising effect by installing a plurality of buoys expressing the ad text on the beach of the beach.;The present invention is a buoy which is installed in the sea of the beach is connected to a plurality of buoys, is provided with an advertising surface (2) inscribed in the ad text on the outer surface of the main body (1) made of a closed hollow body, the inner bottom of the main body (1) Balancing weight (4) is inserted and fixed, the lower end of the main body (1) and the lower side of each side is connected to the connecting rope (7) for connecting the weight (5) hanging hooks (6) and adjacent buoys, respectively It is characterized by the technical features that the ring (3a) (3b) (3b ') is provided for.
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