Improved structure of conveying device

The utility model discloses an improved structure of a conveying device. The conveying device comprises at least one conveying roller group; the conveying roller group includes a driving rod, a plurality of rollers and two fixing rings; and the rollers are mounted on the driving rod; O-shaped rings are annularly arranged outside the rollers. Frictional force of a thin glass substrate to the rollers is increased by the aid of a plurality of conveying roller groups together with the O-shaped rings on the rollers, so that a body of the thin glass substrate is constantly kept horizontally and stably advancing when in conveying, and the thin glass substrate smoothly enters a next process machine.