A continuous degassing device for a ladling tank comprises a feeding tower and a degassing unit, wherein the feeding tower is provided with a feeding port for feeding furnace burden into the degassing device, wherein the furnace burden is specifically aluminum; the feeding tower is connected with a smelting chamber; the temperature of air in the smelting chamber is controlled within a certain temperature range so as to ensure the smelting of the aluminum; the aluminum is heated and smelted into molten aluminum through the smelting chamber and then the molten aluminum flows into the tank; a heat preserving chamber is arranged above the tank and is connected with the smelting chamber; the temperature of the air in the heat preserving chamber is controlled within a certain temperature range so as to prevent the molten aluminum from solidifying; a rough smelting and nitrogen blowing device, which is specifically a movable steel pipe, is arranged on the side surface of the heat preserving chamber; one end of the movable steel pipe extends into the molten aluminum; the rough smelting and nitrogen blowing device is connected with a gas blowing refine smelting chamber, and the gas blowing refine smelting chamber is connected to the ladling tank in a manner of separating through a ceramic filtering plate; the ladling tank comprises a ladle and a molten aluminum temperature measuring bar; the molten aluminum temperature measuring bar is connected with a heat preserving flame jet device.