The utility model discloses an energy-saving device of a galvanized zinc pot. The device comprises a pot body and a grate leading a steel strip into the pot body, wherein the pot body is provided with a pot opening; and a ceramic fiber pot lid for sealing the pot opening is arranged at the pot opening in the rear of the grate. According to the energy-saving device of the galvanized zinc pot, by virtue of the ceramic fiber pot lid at the pot opening of the zinc pot, the zinc pot surface area is reduced, that is, the radiating area of the zinc pot to the air is reduced; with the reduction of the radiating area, the electricity consumption power of the zinc pot is reduced; and after the surface temperature of a zinc liquid is guaranteed, the surface temperature and temperature of the zinc liquid in a core part can be kept consistent basically, and temperature gradient from the surface to the core part of the zinc liquid is reduced. A ceramic fiber material has the characteristics of high-temperature resistance, corrosion resistance and low heat conduction coefficient, so that with the adoption of the ceramic fiber pot lid, the service life of the pot lid is effectively prolonged while the heat in the zinc pot is effectively prevented from being radiated and the temperature of the zinc pot is kept; and the liquid level can be stabilized, liquid level fluctuation of the zinc pot is reduced, and uniformity of a strip steel zinc layer and surface quality of a galvanized plate are improved.