Vertical take-off and landing miniature air vehicle with variable X-type wing

The invention relates to a vertical take-off and landing miniature air vehicle with a variable X-type wing. The vertical take-off and landing miniature air vehicle comprises a fuselage, a wing, a motor, an airscrew and a take-off and landing device, wherein the wing is bilaterally symmetrical about a body shafting XOZ plane and divided into an upper part and a lower part; the upper wing turns upwards, and the lower wing turns downwards, and the upper wing and the lower wing are respectively mounted on the fuselage; the upper wing and the lower wing on the same side of the air vehicle are distributed in an actual angle; each of the upper wing and the lower wing has a trapezoidal proportion and a sweep back angle; the wing adopts a negative bending wing profile, the front part of the wing has positive camber, and the rear part of the wing has negative camber; an angle of attack corresponding to zero pitching moment is a positive value. The vertical take-off and landing miniature air vehicle can stably realize vertical take-off and landing, level flight, hovering and switching of level flight and hovering, has the characteristics of simple power device, full energy utilization, high aerodynamic efficiency and good controllabitity under each flight condition and large speed coverage, and is suitable for being used as an air vehicle platform of a miniature unmanned aerial vehicle system.