Cellulose fiber liquid ammonia dyeing method

The invention provides a cellulose fiber liquid ammonia dyeing method, which concretely comprises: adopting a cation modification agent and NaOH to treat cellulose fibers, sequentially carrying out hot water washing, cold water washing and acid washing, carrying out water washing to achieve a neutral state, and drying to obtain cationization cellulose fibers; and dissolving a dye capable of being dissolved in liquid ammonia in liquid ammonia, and immersing the prepared cationization cellulose fibers into the liquid ammonia dyeing solution to dye under a certain condition to obtain the dyed subject, wherein the condition comprises that a dye use amount is more than or equal to 10% (o.m.f), a bath ratio is more than or equal to 1:20, and a dyeing time is more than or equal to 20 seconds. With the present invention, problems of high production process energy consumption and heavy water pollution in the existing cellulose fiber dyeing are solved, a dye uptake rate and a color fixation rate of the dye in liquid ammonia dyeing are increased, a dye use amount is saved, advantages of less dyeing process steps, short dyeing time, recycling of dyed dye, environmental pollution reduction, and the like are provided, and waterless dyeing requirements during a fiber dyeing process can be achieved.