Disclosed is a solar-powered unmanned aerial vehicle. The layout of a single vehicle body is adopted. A front wing is designed as a long-strip-shaped main lifting surface with a large area. High efficient motors and storage batteries are evenly distributed on the left end and the right end of the front wing through power nacelles, so that the front wing is made to be a main loaded surface, and the bearing force of the front wing is even in air or on the ground. A rear wing serves as an assisting lifting surface for a full flight control surface. The front lifting surface and the rear lifting surface both provide positive lifting force; the pneumatic efficiency of the pneumatic layout is improved; and the areas of the positions, where solar cells are laid, on both the lifting surfaces can be maximized. Extensible control modes are adopted for control surfaces of a left auxiliary wing and a right auxiliary wing. Stay-wire type drive mechanisms are adopted for control of the control surfaces of the auxiliary wings and control of an undercarriage. A vertical control wing is driven by a crank shaft and a connecting rod of a gear motor so that the rear wing can be controlled, the whole deflection control over the vertical control wing and the rear wing is achieved, and the control structures of the front wing and the rear wing correspondingly are simple and effective. An efficient high-power-density and high-reliability light-weight motor power system for the solar-powered unmanned aerial vehicle is formed by slender-form coreless brushless dipolar permanent magnet direct current motors, and the specific gravity of the whole vehicle is effectively reduced.