Salt-free low-alkali cellulose fiber modified dyeing method

The invention relates to a salt-free low-alkali cellulose fiber modified dyeing method, belonging to the technical field of textile dyeing. The dyeing method comprises the steps of cellulose fiber modification treatment, water washing treatment, dyeing and after-treatment, wherein in the step of cellulose fiber modification treatment, an epichlorohydrin parent derivative of epoxy quaternary ammonium salt and cationic starch are adopted for modification treatment of cellulose fibers. The salt-free low-alkali cellulose fiber dyeing method has the beneficial technical effects that two kinds of specific modifiers are adopted, the synergistic effects of the modifiers are given play to and the specific dyeing steps are provided, so that salt-free low-alkali dyeing of the cellulose fibers is achieved, pollution is reduced, the cost is saved, the process is simplified, the difficulty is reduced, and the modification and dyeing effects are good; therefore the dyeing method is suitable for large-scale industrial production.