The invention relates to a method for producing a 30-count siro spinningslubby yarnthrough mono-tencel fiber spinning. The 30-count siro spinningslubby yarn is produced through procedures that cotton is cleaned and combed, tencel fiber is pre-combined, the heads are combined, the tails are combined, and the yarn is roughed, refined, and spooled. In the cotton cleaning procedure, the cotton is finely grasped, is combed for multiple times and hit slightly, is uniformly mixed and pressed laterally, the hitting speed is reduced, and the cotton is slowly loosened; in the cotton combing procedure, the combing quality is improved, and the fiber damage is reduced; in the combination procedures, rear-area traction is intensified in the head combination procedure, the rear-area traction is reduced in the tail combination procedure, the quantity is slightly fixed, the pressure is boosted, the speed is slow, the cotton is uniformly fixed, the extension parallelism degree of fiber is increased, and bent fiber is reduced; in the yarn roughing procedure, the quantity is slightly fixed, the pressure is boosted, the speed is slow, and the twisting degree is large; in the yarn refining procedure, a siro spinning and intelligent slubby yarn device is additionally mounted on a yarn refining machine; in the spooling procedure, a pressurizing device is additionally mounted on an automatic spooling machine idle pressing line, and knots can be well tied. The slubby yarn provided by the invention is soft, smooth and comfortable, high in dry and wet resistance, good in air permeability and damp absorption property, good in water washing stability and rich in concave and convex three-dimensional feeling.