The utility model provides a melting maintaining furnace, which inhibits the formation of oxide by a relatively simple structure, thereby improving the production efficiency and reducing the operationcost. The melting holding furnace is provided with a melting furnace body and a material introduction mechanism for supplying molten metal to the melting furnace body. The melting furnace body is provided with a melting chamber, a liquid collecting chamber, a drawing-out chamber and a molten metal heating mechanism. The melting chamber is provided with a melting chamber cover; the material introducing mechanism is provided with a liquid level sensor; at least detecting that the liquid level position of the molten metal in the drawing-out chamber drops to a lower limit level, the lower limit level is set to be above the height position of the lower surface of the melting chamber cover in the drawing-out chamber; and when the liquid level sensor detects that the liquid level position of thedrawing-out chamber is lowered to the lower limit level, at least one of the molten metal and the metal block is supplied to the liquid receiving chamber, so that the liquid level position of the drawing-out chamber is always kept at the position above the lower surface height position of the melting chamber cover.