Flood prevention buoy

The utility model provides a flood prevention buoy, belongs to the technical field of water area water level condition monitoring, and aims to solve the problems that in the working process of an existing flood prevention buoy, dirt such as moss is prone to being attached to the surface of the bottom of a water gauge, and it is troublesome for workers to know whether the water level exceeds a warning line or not under the condition that light is poor at night and the like. Comprising an insertion rod; the anchoring part is fixedly connected to the lower surface of the insertion rod; the number of the water level gauges is three, and the lowermost water level gauge is fixedly connected to the upper surface of the insertion rod; the buoy is connected to the outer sides of the three water gauges in a sliding manner; the sealing assembly is arranged in the insertion rod and at the bottom of the buoy; and the night warning assembly is arranged at the top of the water gauge. According to the water level gauge, dirt