The invention discloses a water safety facility. The water safety facility comprises a buoyancy tank (1) floating on the water surface of a reservoir, the lower end of the buoyancy tank is connected with one end of a chain (13), and the other end of the chain is connected with a flood draining pipe plugging body (4) which is pressed on a pipe opening of a flood draining pipe (8) extending into the bottom of the reservoir in the vertical direction so as to plug the pipe opening; the upper portion of the pipe opening of the flood draining pipe is connected with a guide pipe (16) used for limiting shifting of the flood draining pipe plugging body in the horizontal direction so as to avoid the situation that the flood draining pipe plugging body cannot completely cover the pipe opening of the flood draining pipe; the right side of the buoyancy tank (1) is provided with a plurality of lantern rings (11) distributed in the vertical direction and located on the same vertical straight line; the lantern rings are connected with a guide column (2) in a sleeving mode; and the upper end and the lower end of the guide column are fixed to the side wall of a dam (10) through connection columns (3). The water safety facility not only can prevent objects floating in water from blocking a flood draining channel in the flood draining process, but also can adjust the flood draining water level flexibly according to the flood draining requirements.