The invention discloses a production process of a thin side-stretch fabric. The production process comprises the following steps of S1 warping, S2 beam dyeing pretreatment, S3 beam dyeing, S4 soapingand color fixing, S5 foam slashing, S6 weft yarn unwinding, S7 weft yarn pretreatment, S8 weft yarn dyeing, S9 weft yarn soaping, S10 weaving and S11 after treatment. According to the production process of the thin side-stretch fabric, warp yarn is dacron spandex core-spun yarn, beam dyeing and sizing are adopted, weft yarn is subjected to cone yarn dyeing, stain fabric weave is adopted, and therefore polyester fibers are arranged on one face of the fabric, and blended tencel and Coolmax fibers are presented on the other face of the fabric. The polyester fibers have the advantages of being resistant to wear, high in brute force and the like, the face, in contact with the skin, of the tencel and Coolmax fibers has the functions of being good in hygroscopicity, resistant to static and bacteria and the like, and the comfort of the fabric is improved. Beam dyeing and sizing are adopted, fluff and nep on warp yarn can be reduced, and weaving is conducted smoothly.