A shoulder-filled inflatable bag comprising: a box body comprising: a front surface wall comprising a plurality of front wall air columns, a front end and a bottom end of the front wall air column being respectively defined as a first top edge and a first bottom edge; a rear surface wall opposite to the front surface wall, the rear surface wall comprising a plurality of rear wall air columns, a front end and a bottom end of the rear wall air column being respectively defined as a second top edge and a second bottom edge, two sides of the rear surface wall being bonded to two sides of the front surface wall, the rear surface wall and the front surface wall being bonded by heat sealing to form two heat sealed blocks, and there being a contraction cavity between the heat sealed blocks; and a top surface wall comprising a plurality of top surface air columns, two sides of the top surface wall being respectively connected to the first top edge of the front surface wall and the second top edge of the rear surface wall, to form a first accommodating space and a lateral passage respectively, the first accommodating space being located inside the contraction cavity, and the lateral passage being located outside the contraction cavity; and a cover body combined with the box body, the cover body comprising a front surface wall and a rear surface wall opposite to each other, and a connection surface wall, two sides of the front surface wall being bonded to two sides of the rear surface wall, and two sides of the connection surface wall being respectively connected to a bottom end of the front surface wall and a bottom end of the rear surface wall to form a second accommodating space. a box body comprising: a front surface wall comprising a plurality of front wall air columns, a front end and a bottom end of the front wall air column being respectively defined as a first top edge and a first bottom edge; a rear surface wall opposite to the front surface wall, the rear surface wall comprising a plurality of rear wall air columns, a front end and a bottom end of the rear wall air column being respectively defined as a second top edge and a second bottom edge, two sides of the rear surface wall being bonded to two sides of the front surface wall, the rear surface wall and the front surface wall being bonded by heat sealing to form two heat sealed blocks, and there being a contraction cavity between the heat sealed blocks; and a top surface wall comprising a plurality of top surface air columns, two sides of the top surface wall being respectively connected to the first top edge of the front surface wall and the second top edge of the rear surface wall, to form a first accommodating space and a lateral passage respectively, the first accommodating space being located inside the contraction cavity, and the lateral passage being located outside the contraction cavity; and a front surface wall comprising a plurality of front wall air columns, a front end and a bottom end of the front wall air column being respectively defined as a first top edge and a first bottom edge; a rear surface wall opposite to the front surface wall, the rear surface wall comprising a plurality of rear wall air columns, a front end and a bottom end of the rear wall air column being respectively defined as a second top edge and a second bottom edge, two sides of the rear surface wall being bonded to two sides of the front surface wall, the rear surface wall and the front surface wall being bonded by heat sealing to form two heat sealed blocks, and there being a contraction cavity between the heat sealed blocks; and a top surface wall comprising a plurality of top surface air columns, two sides of the top surface wall being respectively connected to the first top edge of the front surface wall and the second top edge of the rear surface wall, to form a first accommodating space and a lateral passage respectively, the first accommodating space being located inside the contraction cavity, and the lateral passage being located outside the contraction cavity; and a cover body combined with the box body, the cover body comprising a front surface wall and a rear surface wall opposite to each other, and a connection surface wall, two sides of the front surface wall being bonded to two sides of the rear surface wall, and two sides of the connection surface wall being respectively connected to a bottom end of the front surface wall and a bottom end of the rear surface wall to form a second accommodating space.