The utility model belongs to the technical field of an electric heating device, and relates to a built-in dual-thermostat electric heating tube device. A spiral long strip type resistance wire is sleeved in a bent cooling tube in a sealing way, the inner space of the cooling tube is uniform, the two ends of the resistance wire are respectively connected with one ends of two lower leading-out rods with symmetric structures, and the two lower leading-out rods are respectively and fixedly arranged at the two ends of a fixing frame; the other ends of the lower leading-out rods are connected with a temperature control fuse component, the other end of the temperature control fuse component is connected with an upper leading-out rod, the other end of the upper leading-out rod is fixedly connected with a terminal, and a terminal sheath is sleeved on the connection part of the terminal and the upper leading-out rod; and the terminal, the upper leading-out rod, the temperature control fuse component and the lower leading-out rods are connected in series and then are arranged at the port of the cooling tube, and the outer edge of the whole structure is sleeved in the terminal sheath and is fixedly arranged on the fixing frame, thereby forming an integrated structure. The structural principle is simple, the processing technology is mature, and the device is low in manufacturing cost, and has a long service life, high thermal efficiency and good safety performance.