The invention discloses an air bag arterial cannula with a suction function, and belongs to the technical field of medical devices. The air bag arterial cannula comprises a cannula body, a butterfly-shaped air bag, an air bag inflation tube, a drainage port, a cannula wall interlayer and a suction outlet; the cannula body is used for descending aorta perfusion, the butterfly-shaped air bag is usedfor blocking a gap between the cannula body and a descending aorta tube cavity, and meanwhile, possibly existing backflow blood is completely collected to a drainage port at the lowest point of a connection part of the butterfly-shaped air bag and the cannula; the air bag inflation tube is communicated with the butterfly-shaped air bag and is used for inflating gas or liquid into the butterfly-shaped air bag; the drainage port is used for sucking blood which flows backwards to the drainage port; the drainage port is arranged on an annular line at the joint of the outer surface of the cannulabody and the outer surface of the butterfly-shaped air bag; the interlayer of the cannula wall is a channel for leading out the reflux blood. The cannula is used for performing descending aorta distalperfusion after hypothermia with circulatory arrest of aortic arch operation, and the hypothermia with circulatory arrest time is obviously shortened.