Making acrylic synthetic fiber with smooth surface includes preparation of copolymers containing 15-30% organic solvent and water spinning spinning solution consisting of copolymers of acrylonitrile containing monomer unit and containing more than 86% unsaturated sulfonate monomers of vinyl monomers with single-ene, copolymers containing sulfonate 22-75 mEq, the average molecular weight of 50,000-100,000, spinning solution, 0.5% -8% moisture content, 45 viscosity of 50-140 ℃park, spinning solution as described in 0 ° -40 ℃, with 40% -70% organic solvent condensate spinning solution for spinning silk, traction than 0.1-1.0. Until the acrylic synthetic fiber has at least four times extension, and after washing, hot water extension, oil processing, drying, curling process, to get a smooth surface of the acrylic synthetic fiber.
