step 1, preparing a spinning dope;

PVAc is used as a raw material, and dissolved with addition of methanol before filtration, and then the spinning dope is obtained;

step 2, spinning;

the spinning dope is injected into a spinneret, and the ejected fibers are brought into a direct current electrolytic cell, the PVAc undergoing a series of reactions of an alcoholysis, an electrolytic catalytic alcoholysis, and a levering of the alcohol; the solution formulation in an electrolytic coagulation bath comprising alkali, alcohol, and water;

step 3: acid bath;

the fiber passing through the electrolytic cell is placed into an acid solution with pH value of 4.5-6.9 for an acid bath;

step 4: forming a finished polyvinyl alcohol fiber product by stretching, drying, washing with water, crimping with hot water and packaging.