The invention relates to a continued extension device in a hollow organ lumen. The continued extension device comprises a tube body, wherein folding sacs which can be expanded in the axial direction of the tube body are arranged at the front end or in the middle section of the tube body; and folding sac injection nozzles which communicate with the folding sacs are formed in the rear end of the tube body. The invention aims to provide the continued extension device in the hollow organ lumen. An operation of the device is simple, the time for extending an esophagus can be effectively shortened,and pain is reduced. The continued extension device disclosed by the invention has the advantages that continued extension in an esophagus lumen is quicker; and the extension device is arranged at thelower section of the esophagus during gastrostomy, so that a thoracic surgery is avoided; 3, the extension device is arranged at one time, and the esophagus is extended continuously, so that the paincaused by expanding for several times is reduced; 4, the diameter is expanded while continuous extension in the lumen is carried out at the same time, so that anastomosis is facilitated; 5, the extension device in the esophagus lumen is simple to operate, the replicability is high, and popularization is easy; and 6, a magnetic body is arranged at the front end of the tube body, together with combined treatment of the continued extension device in two hollow organ lumens, so that the extension speed is quickened through magnetic attraction.