The invention discloses an attitude adjusting device for a bionic butterfly flapping wing air vehicle. The attitude adjusting device for the bionic butterfly flapping wing air vehicle comprises at least two IPMC materials, an electrode, a high-molecular elastic polymer film, a fixing bracket and an IPMC controller; each IPMC material is connected with the metal electrode and packaged by using thehigh-molecular film; the packaged material is stacked and packaged by using a film; a lead led out from the electrode is connected with a controller mounted at the head of the air vehicle; and the whole attitude adjusting device is fixed at the tail end of an air vehicle bracket. Compared with the existing attitude adjusting device for the bionic butterfly flapping wing air vehicle, the attitude adjusting device for the bionic butterfly flapping wing air vehicle has the advantages that the flight attitude can be more greatly adjusted, the attitude adjusting device is easily controlled, different control requirements, such as pitching angle control and pitching turnover speed control, on the air vehicle can be satisfied only by controlling the voltage size and the waveform; and as the IPMCmaterial is softer, the anti-collision ability of the tail of the air vehicle is also obviously improved.