The invention provides a corn fiber (PLA) pure or blended melange spinning yarn and a production method thereof. The melange spinning yarn contains corn fiber. Yarn made from fibers of different colors through mixed color spinning. The technical process of the present invention is: corn fiber pre-opening, dyeing (pure cotton natural color combed cotton net dyeing, corn fiber dyeing), dyed corn fiber spinnability treatment, weighing, mixing, cleaning, carding, head Parallel, double, triple, roving, spun yarn, winding, such as spinning strands, then go through the doubling and twisting machine and winding. The pure or blended melange spinning yarn of corn fiber of the present invention meets the national standard, and the fabric woven by it has a smooth and clean surface, good drape, light and comfortable to wear, soft, moisture-absorbing and breathable, rich in color, and belongs to green. Eco-friendly textile products.