Fixed-wing unmanned aerial vehicle stable in landing

The fixed-wing unmanned aerial vehicle comprises a fuselage, an empennage, wings and propellers, the two wings are oppositely arranged on the two sides of the middle of the fuselage, the wings comprise the inner wing, the middle wing and the outer wing, the inner wing is connected to the fuselage, the middle wing is slidably sleeved with the inner wing in the length direction of the inner wing, and the propellers are arranged in the middle of the fuselage. The outer wing is slidably sleeved with the middle wing in the length direction of the middle wing, the propeller is fixedly arranged on the lower side of the end, away from the inner wing, of the middle wing, the empennage is slidably arranged on the rear portion of the fuselage in the length direction of the fuselage, and a tail rotor is arranged at the end, away from the fuselage, of the empennage. Wing unfolding mechanisms are arranged in the wings, and extending mechanisms are arranged between the empennages and the fuselage. The invention aims to solv