The invention provides an intraoperative stent delivery system and an use method thereof. The intraoperative stent delivery system is used for loading and delivering the intraoperative stent. The intraoperative stent delivery system comprises a main body operating handle, a main body lining bar and a branch swing mechanism; the main body lining bar is arranged at the front end of the main body operating handle; the branch swing mechanism is also arranged at the front end of the main body operating handle; the main body operating handle comprises a front end cover, a middle handle, a rear end cover, a main body stent release portion, a branch support release portion and a lock cover; the main body lining bar comprises a bending bar, a limit ball and a guide head; and the branch swing mechanism comprises a sliding block , a transmission bar and a U-shaped ring. The invention also includes a method by using the system to deliver the intraoperative stent. The system can be used for delivering and releasing the single branch intraoperative stent so that the single branch intraoperative stent can solve the problem that the intraoperative stent is difficult to be matched with branch vessels, especially for the anastomosis with the left subclavian artery, accordingly the dissociation, the blocking and the anastomosis of the super-aortic branch vessels can be reduced or avoided so as toreduce the difficulty of surgery as well as the trauma of the surgery.