A thoracic aortic stent structure, including a main stent having at least one sub-stent which is formed as a piece on the main stent; and a membrane covering the main stent and the at least one sub-stent, and having at least one side-opening corresponding to a free end of the at least one sub-stent. The membrane compresses the main stent and the at least one sub-stent, which causes diameter of the main stent and the at least one sub-stent narrower. Upon removing the membrane, the main stent and the at least one sub-stent can extend to reconstruct a vascular pathway. The thoracic aortic stent is able to simplify the process, of placement, save time and provide easy operation.