The invention relates to a loose fiber dyeing process and belongs to technical field of fiber dyeing. The process sequentially includes: grabbing cotton, forming nets, soaking, mangling, forming rolls, cold piling, unrolling, washing, squeezing, splitting, spreading and drying. Squeezed loose fibers are fed to the spreading procedure after splitting, the loose fibers are squeezed at the squeezing force of 3-15kg / cm<2> under the premise of not damaging the fibers, the squeezed dyed fibers are directly fed through a lower conveying belt to an eight-cage dryer or a loose fiber high-frequency dryer for drying. By the process, the defects that continuous production cannot be performed and machining efficiency is low in conventional technologies are overcome, the defects that of uneven dyeing, low drying efficiency, large energy consumption and the like when the loose fibers are dried in a net structure are overcome, fiber damage is low during processing, and the quality of the finished fibers is guaranteed.