The invention relates to a chemical fiber setting technology, in particular to a low-melting-point polyester setting technology. Low-temperature thermal shrinkage setting and strong-wind cooling are adopted in a sheath-core composite low-melting-point fiber setting method, wherein the thermal shrinkage temperature ranges from 50 DEG C to 70 DEG C, the thermal shrinkage time ranges from 15 min to 45 min, and fibers are subjected to rapid cooling by a strong-cold fan after leaving a setting area. The surfaces of low-melting-point polyester staple fibers obtained according to the technology are smooth to a certain degree, good in dispersibility, small in specific resistance and stable in thermal shrinkage, and the low-melting-point polyester staple fibers treated by the method can be used at 150-210 DEG C and can be used for producing sound insulation, thermal insulation and waterproof materials such as hard cotton, needle punched non-woven fabric, hot-air bonded nonwoven fabric, silk-like cotton, palm/coconut palm mattresses, shoe materials and the like.