The invention provides a manufacturing method of a resin lens. The resin lens is composed of a resin substrate, nanometer fragrance microspheres and a fragrance hardened membrane layer. According to the lens, certain proportion of nanometer fragrance microspheres are added in silicon dioxide hardening liquid for hardening the surface of the lens, a transparent and hard wear-resistant coating layer is formed on the surface of the lens after the hardening liquid in which the nanometer fragrance microspheres are fused is dip-coated on the surface of the resin lens and dried and cured and the dual functions that the lens is not scratched when it is wiped and the microspheres are opened to give out scent of fragrance can be achieved so as to have the characteristics that lens wiping and maintenance are convenient, the fragrance is intense and persistent and the effect is obvious.