The invention provides a wing, a deformation device and an aircraft. The wing comprises a first wing and a second wing, wherein the first wing comprises a connecting piece and an air bag; the connecting piece is arranged at one end of the first wing, and the air bag is arranged in the connecting piece so as to enable the connecting piece to be subjected to extension deformation along with the inflation of the air bag or contraction deformation along with the deflation of the air bag; and one end of the second wing is connected with the first wing through the connecting piece so as to enable the first wing to move away from the horizontal plane determined by the second wing along with the extension deformation of the connecting piece when the connecting piece is subjected to the extension deformation or get close to the horizontal plane determined by the second wing along with the contraction deformation of the connecting piece when the connecting piece is subjected to the contraction deformation. According to the wing, the deformation device and the aircraft, the rapid deformation of the wing can be realized through a light structure