Automatic retractable buoy lamp based on day and night changes and using method thereof

The invention belongs to the field of navigation auxiliary equipment, in particular to an automatic retractable buoy lamp based on day and night changes and a using method thereof. The buoy comprisesa buoy body, a cavity is formed in the buoy body; a sliding plate is slidably connected into the cavity; a plurality of reset springs are fixedly connected between the sliding plate and the cavity, evaporated liquid is injected into the cavity and located on the lower side of the sliding plate, a sliding rod is fixedly connected to the sliding plate, one end of the sliding rod penetrates through the buoy body and is fixedly connected with a first toothed rod, and a first gear is rotatably connected to the side wall of one side of the buoy body. A warning lamp can be automatically folded and unfolded according to day and night changes through day and night temperature difference changes and the gas-liquid conversion of evaporated liquid, the warning lamp is effectively prevented from beingexposed to the sun in the