An adjustable inflatable neck support device, comprising: a center support body having a top surface configured to support a neck of a user and a bottom surface concavely provided with a first chamber ; a first inflatable airbag configured to be accommodated within the first chamber , expand or contract along a displacement axis, and displace the top surface of the center support body along the displacement axis; two second inflatable airbags , each configured to be accommodated within a corresponding one of second chambers that are concavely provided on the bottom surface of the neck support device (S) and located at opposite sides of the first chamber , expand or contract along the displacement axis, and displace a top surface of the neck support device (S) along the displacement axis; and an inflation device configured to be connected to the first inflatable airbag and the second inflatable airbags , respectively, and inflate or deflate the first inflatable airbag and the second inflatable airbags to change expansion or contraction degrees of the first inflatable airbag and the second inflatable airbags , wherein the neck support device (S) is divided into at least a supporting portion (S 1) including the center support body and the first inflatable airbag and a bearing portion (S2) configured to bear an occiput of a user when the user is in a supine position, and further comprises a pillowcase and a plurality of physical therapy portions fastened to the pillowcase ; a height of a top surface of the bearing portion (S2) is lower than a height of a top surface of the supporting portion (S1); and at least one of the physical therapy portions is fastened to a position on the pillowcase that corresponds to a position of the center support body , and is configured to abut against the neck of the user and be electrically connected to a physical therapy device to receive electric power transmitted from the physical therapy device . a center support body having a top surface configured to support a neck of a user and a bottom surface concavely provided with a first chamber ; a first inflatable airbag configured to be accommodated within the first chamber , expand or contract along a displacement axis, and displace the top surface of the center support body along the displacement axis; two second inflatable airbags , each configured to be accommodated within a corresponding one of second chambers that are concavely provided on the bottom surface of the neck support device (S) and located at opposite sides of the first chamber , expand or contract along the displacement axis, and displace a top surface of the neck support device (S) along the displacement axis; and an inflation device configured to be connected to the first inflatable airbag and the second inflatable airbags , respectively, and inflate or deflate the first inflatable airbag and the second inflatable airbags to change expansion or contraction degrees of the first inflatable airbag and the second inflatable airbags , wherein the neck support device (S) is divided into at least a supporting portion (S 1) including the center support body and the first inflatable airbag and a bearing portion (S2) configured to bear an occiput of a user when the user is in a supine position, and further comprises a pillowcase and a plurality of physical therapy portions fastened to the pillowcase ; a height of a top surface of the bearing portion (S2) is lower than a height of a top surface of the supporting portion (S1); and at least one of the physical therapy portions is fastened to a position on the pillowcase that corresponds to a position of the center support body , and is configured to abut against the neck of the user and be electrically connected to a physical therapy device to receive electric power transmitted from the physical therapy device . <EOS>