The present invention relates to a rotating structure comprising a rotating shaft and rotating wheels respectively connected with both ends of the rotating shaft, wherein each rotating wheel comprises an inner wheel cover, an outer wheel cover and a turning mechanism arranged between the inner wheel cover and the outer wheel cover; the inner wheel cover and the outer wheel cover are mutually fastened and connected to form one rotating wheel through convex posts and connection through holes which are evenly arranged along wheel rotating concentric circumference; the turning mechanism comprises a drive device and extending arms; and the extending arms are movably connected on the convex posts. One end of each extending arm is driven to extend outside the rotating wheels by the drive device to change the rotating radiuses of the rotating wheels, and thus, the rotating wheels with different rotating radiuses can generate line speed difference under the same angular speed to realize a turning function.