The invention discloses a preparation method of a hydrophilic cotton-like
polyester fiber. The preparation method is characterized by comprising the following steps: (1) dissolving chelate formed in a
calcium chloride water solution by virtue of
polyvinyl alcohol; (2) carrying out mixing
granulation on
polyester chips, a molecular weight modifier, an
antioxidant and a
lubricant so as to obtain cooled master batches; (3) carrying out blending and
melt spinning on the obtained modified
polyvinyl alcohol, the cooled master batches and
polyester chips, and carrying out final
processing to prepare the cotton-like polyester
fiber. The invention further provides the hydrophilic cotton-like polyester
fiber prepared by the preparation method. The fiber comprises 0.1wt%-5wt% of the modified
polyvinyl alcohol, 0.005wt%-0.05wt% of the molecular weight modifier, 0.002wt%-0.02wt% of the
antioxidant and 0.002wt%-0.02wt% of the
lubricant; the fiber has the coefficients that the
moisture regain is more than or equal to 2.0%, the water
absorption rate is more than or equal to 250%, the
evaporation rate is more than or equal to 0.18g / hr, the
breaking strength is more than or equal to 2.5cN / dtex, the elongation at break is more than or equal to 20%, and the volume resistivity is less than or equal to 108
omega.cm. The cotton-like polyester fiber disclosed by the invention has the advantages that the
moisture absorption performance is good, and the comfort level is greatly improved.