Preparation process of disposable underpants with high elasticity and product of disposable underpants

The invention relates to the technical field of disposable underpants, in particular to a high-elasticity disposable underpants preparation process and a product thereof, and the high-elasticity disposable underpants preparation process comprises the following preparation steps: S1, DTY filaments and polypropylene fibers are twisted into plied yarns, then the plied yarns are soaked in a polyvinyl alcohol solution with the mass fraction of 20-35% for 24-28 h, and the plied yarns are taken out and dried to obtain soft plied yarns; s2, the soft plied yarns are woven into grey cloth, the warp and weft density of the grey cloth is (50-70) * (40-60) pieces/Kg, the warp shrinkage rate is 1-2%, and the weft shrinkage rate is 9-12%; s3, performing first shaping, soaping, water washing and second shaping on the gray fabric to obtain an elastic fabric; and S4, preparing the elastic fabric into disposable underpants with high elasticity. The disposable underpants have the advantages that the transverse elasticity of the