The invention discloses an unpiloted aircraft. The unpiloted aircraft is characterized by comprising a fixed airfoil, an elevator or two elevons, one or more perpendicular stabilizers, one or more rudders, a pair of coaxial contra-rotating propellers, a receiver and a battery, wherein the fixed airfoil consists of a trailing-edge-warping airfoil profile, and is low in aspect ratio; the elevator or the two elevons are located next to the inner side of the trailing edge of the airfoil; the perpendicular stabilizers are located on a symmetry plane of the aircraft and extend to the upper side and the lower side of the airfoil; the rudders are additionally arranged behind the perpendicular stabilizers; the coaxial contra-rotating propellers are located on the symmetry plane of the aircraft and at the upper part of the airfoil, and are driven by a motor; and the midpoint of a chord line of the section of an airfoil root is in the lower part of or level with the midpoint of a chord line of the section of an airfoil tip. The unpiloted aircraft disclosed by the invention can execute high-skill complex tasks which cannot be executed by various conventional fixed wing aircrafts or rotor aircrafts, can perpendicularly take off and land, can fly horizontally in a posture of the fixed airfoil, and can be changed into a rotor posture for acquiring images and videos at any time; and the unpiloted aircraft disclosed by the invention is small and exquisite, flexible and stable, and the maximum speed, the endurance capability and the energy saving effect of the unpiloted aircraft disclosed by the invention are all higher than those of each of the rotor aircrafts with equal size and equal weight.