The invention discloses a novel anastomosis system of blood vessels and a blood vessel stent. The system comprises a branched artificial blood vessel group, a stent artificial blood vessel group, a suture-free ring and an anastomosis buckle device; a main body of the branched artificial blood vessel group is a main body artificial blood vessel of a tubular structure, a main branched artificial blood vessel of a tubular structure is fixedly communicated with the upper end of the main body artificial blood vessel, and three branched blood vessels are fixedly communicated with the upper end of the main branched artificial blood vessel. By means of the system, the surgical step is simplified, the surgical difficulty is lowered, then the in-vitro time, the surgical time, the deep hypothermia circulatory arrest time and the brain protection time are greatly shortened, the surgical mortality rate is reduced, and the morbility of nervous systems and other complications is lowered at the same time. Few anastomotic stomas are involved, through buckling of the anastomosis buckle device and the suture-free ring, the bleeding probability is lowered, the mortality rate is lowered accordingly, and the success probability of operations is greatly lowered.