The invention discloses a heat preservation control method of a cooking utensil. The cooking utensil comprises a pot body, an upper cover assembly provided with a steam channel, an opening and closing assembly and a gas pump. The opening and closing assembly is used for opening or closing the steam channel. The gas pump is used for drawing gas in a containing cavity outwards. The heat preservation control method comprises the steps that after the cooking utensil enters a heat preservation stage, the steam channel is closed by the opening and closing assembly, the gas pump is started, the gas pump stops running after running for a first time, the gas pump is started after stopping running for a second time, the process is repeated in this way, and the gas pressure in the containing cavity is maintained within a set range; and after the vacuum state continues for a preset time, the gas pump stops gas drawing, and the steam channel is opened by the opening and closing assembly. According to the heat preservation method of the cooking utensil, heat and water loss in the heat preservation stage is reduced, breeding of germs in a pot is restrained, and the food quality keeping time is prolonged. Running of the gas pump is controlled according to time, the structure is simple, and the cost is low.