Method for preparing oxidated chitin nanofiber dispersion liquid

The invention discloses a method for preparing oxidated chitin nanofiber dispersion liquid. Pretreatment is conducted on chitin raw materials, laccase and TEMPO are added, and a laccase and TEMPO oxidation system is prepared; oxygen is pumped into a reaction system continuously, oxidation reaction is conducted for 24-130 hours; after the reaction is finished, supernate is filtered through centrifugation, and the supernate is reused; a sediment is water insoluble oxidated chitin which is cleaned through deionized water to be neutral; the deionized water is added, an oxidated chitin water suspension is obtained through stirring, homogenate and ultrasonic treatment are conducted, centrifugation is conducted, and the supernate, namely, the oxidated chitin nanofiber dispersion liquid is obtained. According to the method for preparing the oxidated chitin nanofiber dispersion liquid, the oxidation efficiency is guaranteed, pollution of halogen elements to environment is avoided simultaneously, the reaction system can be reused, the utilization rate of the oxidation system is increased, the oxidation effect is uniform, the yield of chitin nanofibers is increased, and the nanofibers with uniform shapes can be obtained.