The invention relates to the dyeing and finishing project technical field in the printing and dyeing industry production and discloses a cotton loose fiber rapid dyeing technique, comprising the dyeing of the cotton loose fiber, the post treatment and the drying, wherein, in the dyeing technique, the apposition scouring and the dyeing technique are adopted. The prior cotton loose fiber dyeing adopts the high temperature boiling-off or the low temperature pre-treatment, angle water should be discharged after the processes, otherwise, the dye uptake is low and the dye use level is increased. The apposition scouring rapid dyeing technique can short the production flow time by 20 percent, decrease the energy such as water, electricity and air consumption by more than 20 percent; moreover, the ability of fiber is increased due to the shortened fiber processing time, the tactility and the spinnability are improved, the production cost is lower and the environment is protected.