Natural retarding agent for dyeing of cationic dye and using method of natural retarding agent

The invention discloses a natural retarding agent for dyeing of cationic dye. The natural retarding agent is at least one of chitosan and derivatives thereof, wherein the concentration of the chitosan or the derivatives thereof is 0.1-4g/L. According to the retarding agent, natural chitosan or derivatives thereof, such as carboxymethyl chitosan and hydroxypropyl chitosan with different molecular weights are adopted for dyeing of cationic dye, and the problem that 1227 contains benzalkonium chloride and CTAB (cetyltrimethyl ammonium bromide) has strong fishy smell when a conventional cationic dye is used for dyeing are solved; and the prepared product has the quality consistent with that of a product prepared by adopting a conventional process, and has a certain antibacterial and anti-static performance. The technical scheme disclosed by the invention is simple in process and convenient to operate, does not have special requirement on cationic dye and equipment, and can be applied to large-scale production by