An external upset oil tube restoration structure used for an oil and gas well comprises a tube body, a coupling and an adaptor. Buttress outer threads are machined on the outer surface of one end of the tube body, and external upset round threads are machined on the outer surface of the other end of the tube body. External upset round threads are machined on inner walls of two ends of the coupling. Buttress inner threads are machined on the inner wall of one end of the adaptor, and external upset round threads are machined on the outer surface of the other end of the adaptor. The external upset round threads at one end of the tube body are connected with the external upset round threads at one end of the coupling in a screwing mode, and the buttress outer threads at the other end of the tube body are connected with the buttress inner threads of the adaptor in a screwing mode. According to the restoration structure, a thread damage section of an external upset oil tube can be timely replaced, the restoration structure can be directly connected with the standard external upset oil tube, good exchangeability is achieved, tensile strength of the restored oil tube is the same as that of original external upset round threads, restoration cost is reduced, restoration efficiency is improved, and the external upset oil tube which is restored through the restoration structure has identical use performance as the standard external upset oil tube.