Floating liquid level meter

The utility model provides a floating liquid level meter which comprises a buoy, a marker post and a cover plate, a through hole for the marker post to penetrate through is formed in the cover plate,the upper end of the marker post is located above the cover plate, the lower end of the marker post is located below the cover plate, the lower end of the marker post is connected with the buoy, and the cover plate can cover a tank opening of a heating water tank. When the cover plate covers the opening of the heating water tank, the through hole is communicated with the opening of the heating water tank, and the lower end of the marker post and the buoy are both located in the heating water tank. Through the arrangement of the buoy and the marker post, a worker can judge the height of the water level in the heating water tank by observing the length of the marker post extending out of the tank top on the ground so as to supplement water to the heating water tank in time under the condition that the water amount i