The present invention provides a blood vessel anastomat. The blood vessel anastomat comprises a first anastomosis plate and a second anastomosis plate, the shapes of the first anastomosis plate and the second anastomosis plate are both annular-shaped, the end face of one side of the first anastomosis plate is provided with a nail butting seat, and the end face of one side of the second anastomosisplate is provided with a nail cabin. The first anastomosis plate and the second anastomosis plate are designed to arc structures to allow the first anastomosis plate and the second anastomosis plateto sleeve the outer side of the blood vessel, when the blood vessel is cut off, the blood vessel at the cutting position is tilted outwards or evaginated along the circumference, the tilted or evaginated blood vessel is built on the first anastomosis plate and the second anastomosis plate, through extrusion between the first anastomosis plate and the second anastomosis plate, the evagination portions of the blood vessel are butted together, the tilted or evaginated portions of the blood vessel are fixed through closed nails in the nail cabin so as to improve the closing speed of the blood vessel and shorten the operation time.