The invention relates to a heating tube forming process. A heating tube comprises a quartz glass tube, the inside of the quartz glass tube is coated with an electrode silver paste ring which is electrically connected with an electrode collar, a copper wire is welded onto the electrode collar, the head of the copper wire is welded onto a screw, the opening of an electrothermal film carrier is sealed through a seal cover in which a through hole is formed, and screw penetrates the through hole. The heating tube forming process comprises the steps of spraying a heating film, cleaning the glass tube, drying the glass tube, coating sliver paste, solidifying the sliver paste, welding electrodes, assembling the heating tube, testing the heating tube and capping a plastic connector. The film layer of the heating tube is stable within 5000 hours, and the heating tube is highly reliable; an electrothermal film covers the surface of the electrothermal film carrier, so that the heating surface of the electrothermal film is large, the heat transfer effect is good, the warming is fast, and the heat efficiency is high.