The utility model relates to the technical field of
water environment detection, in particular to a
buoy which comprises a floating disc, a balanced reservoir and a hollow supporting leg, a water inlet hole is formed in the hollow supporting leg, a vertical frame, a
solar cell panel, a
wireless communication module and an
electric heating plate are arranged on the floating disc, a first spring is arranged in an air column, a sealing cover is arranged on the first spring, and an
electrode block is fixedly installed on the inner side of the sealing cover. A clamping groove is formed in the air column, and a spring
electrode is fixedly installed in the clamping groove. The external temperature is reduced, the temperature of air in the floating disc is reduced, the air pressure is reduced, at the moment, the sealing cover slides downwards under the action of the air pressure, the
electrode block slides into the clamping groove and makes contact with the spring electrode, the
electric heating plate is powered on to heat the outer side of the floating disc, and ice around the floating disc is heated and melted; the floating disc can be effectively prevented from being frozen by the water surface when the external temperature is too low, a crane can be used for hoisting the
buoy out through a traction
rope during maintenance, maintenance is facilitated, and meanwhile the
buoy can be conveniently put into water again through a hole generated through heating.