A vibration-absorbing air sheath having improved end-closing structure, for wrapping an object and providing buffering protection to the object, the vibration-absorbing air sheath comprising: a first buffering wall, having at least one first heat-seal edge, and including a plurality of air columns separated therebetween by air column lines that are made through heat sealing and are perpendicular to the first heat-seal edge; a second buffering wall, having at least one second heat-seal edge, being connected to the first heat-seal edge through heat sealing, and including a plurality of air columns separated therebetween by air column lines that are made through heat sealing and are perpendicular to the second heat-seal edge; at least one first node, located on the first buffering wall so that the first buffering wall is allowed to be bent against the first node; at least one second node, located on the second buffering wall so that the second buffering wall is allowed to be bent against the second node; a third buffering wall, formed by bending the first buffering wall and the second buffering wall so as to be defined and connected between the first buffering wall and the second buffering wall, and including a plurality of air columns separated therebetween by air column lines that are made through heat sealing and are perpendicular to the first heat-seal edge and the second heat-seal edge; and an accommodating space, formed by bending the first buffering wall and the second buffering wall so as to be defined between the first buffering wall and the second buffering wall; wherein at each of two opposite ends of the vibration-absorbing air sheath, the first buffering wall and the second buffering wall have said air column lines thereof that come to contact with each other after the bending bound through heat sealing, such that at each said end of the vibration-absorbing air sheath, an opening is formed between lower parts of the first and second buffering walls while a binding portion is formed between upper parts of the first and second buffering walls, in which the air columns of each of the first and second buffering walls inside the binding portion include at least one first air column and at least one second air column that are adjacent to each other and have different diameters, characterized in that the air column line between the first air colunm and the second air column is so configured that the lower part of the first air column outside the air column line has a bigger diameter than the lower part of the second air column inside the air column line, so that a width of the accommodating space corresponding to the binding portion is maximized as the first air column and the second air column jostle with each other. a first buffering wall, having at least one first heat-seal edge, and including a plurality of air columns separated therebetween by air column lines that are made through heat sealing and are perpendicular to the first heat-seal edge; a second buffering wall, having at least one second heat-seal edge, being connected to the first heat-seal edge through heat sealing, and including a plurality of air columns separated therebetween by air column lines that are made through heat sealing and are perpendicular to the second heat-seal edge; at least one first node, located on the first buffering wall so that the first buffering wall is allowed to be bent against the first node; at least one second node, located on the second buffering wall so that the second buffering wall is allowed to be bent against the second node; a third buffering wall, formed by bending the first buffering wall and the second buffering wall so as to be defined and connected between the first buffering wall and the second buffering wall, and including a plurality of air columns separated therebetween by air column lines that are made through heat sealing and are perpendicular to the first heat-seal edge and the second heat-seal edge; and an accommodating space, formed by bending the first buffering wall and the second buffering wall so as to be defined between the first buffering wall and the second buffering wall; wherein at each of two opposite ends of the vibration-absorbing air sheath, the first buffering wall and the second buffering wall have said air column lines thereof that come to contact with each other after the bending bound through heat sealing, such that at each said end of the vibration-absorbing air sheath, an opening is formed between lower parts of the first and second buffering walls while a binding portion is formed between upper parts of the first and second buffering walls, in which the air columns of each of the first and second buffering walls inside the binding portion include at least one first air column and at least one second air column that are adjacent to each other and have different diameters, characterized in that the air column line between the first air colunm and the second air column is so configured that the lower part of the first air column outside the air column line has a bigger diameter than the lower part of the second air column inside the air column line, so that a width of the accommodating space corresponding to the binding portion is maximized as the first air column and the second air column jostle with each other.