The invention discloses an energy-saving dehydrogenation furnace, which comprises an upper material rack, a lower material rack, a hearth, a heating element and at least one circulating fan, wherein the periphery of the inner wall of the hearth is provided with a protective lining, the left end of the hearth is provided with an inlet, the right end of the hearth is provided with an outlet, the inlet and the outlet are both provided with furnace doors, and the bottom surface of the hearth is also provided with a transport device; the heating element is positioned in the hearth, the circulatingfan is positioned on the top of a furnace body, the upper material rack is connected to the left side of the inlet, and the lower material rack is connected to the right side of the outlet; and the furnace doors are connected with the outer walls of the hearth at the inlet and the outlet through a vertical elevator and are sealed by double-channel flexible sealing structures, i.e. the contact points of the furnace doors with the inlet and the outlet are provided with two sealing rings. The energy-saving dehydrogenation furnace disclosed by the invention has low energy consumption and small occupied space, can effectively prevent the deformation of workpieces due to ununiform temperature in the furnace, improves the performance of equipment and prolongs the service life of the equipment.