A blood bag sterile connection method includes the following steps: 1) placing blood bag tubes above the wire box, clamping positions to be cut by using the vascular clamps, and simultaneously moving the two vascular clamps in opposite directions 2) heating the composite metal wire, and cutting the blood bag tubes by using the composite metal wire 3) after cutting the blood bag tubes, aligning the blood bag tubes to be connected 4) moving the two vascular clamps towards each other, rolling away the used composite metal wire, and rolling out a new composite metal wire 5) connecting the blood bag tubes by heating the composite metal wire, and simultaneously moving the two vascular clamps towards each other and 6) returning the wire box to the initial position, taking out the connected blood bag tubes, and returning the vascular clamps to the initial positions.
