The invention relates to an inflatable wing with a controllable sway trailing edge and is characterized in that: the inflatable wing adopts the structural design of split skin lacing wires and comprises a main wing, an auxiliary wing, a connection skin and a piezoelectric fibrous composite unit, wherein the main wing and the auxiliary wing are both of inflatable air bag structure, and form a common wing-shaped curve; the auxiliary wing is connected with the main wing as a body through wire joint; the inner parts of air bags of the main wing and the auxiliary wing are provided with a pluralityof lacing wires that divide the wing into bays which are mutually communicated; two ends of the connection skin are respectively bonded with the main wing and the auxiliary wing the two of which are connected together; and the piezoelectric fibrous composite unit is attached to the connection skin and the bottom edge of the piezoelectric fibrous composite unit is level with that of the connectionskin. The inflatable wing effectively solves the flight control problem of inflatable wings.