The invention discloses a spun-dyed yarn produced by vortex spinning and a process thereof, belonging to the technical field of spinning. According to the invention, short fibers with a certain proportion are colored by fibers to prepare colored fibers. The acquired colored fibers are mixed with the original white short fibers and the mixture is processed by the vortex spinning to acquire the spun-dyed yarn. The spun-dyed yarn prepared by the method disclosed by the invention has the advantages of stable quality, good quality, short process, fast delivery and low cost.