The heat stress in hot summer brings more and more serious thermal diseases due to global warming, thus adversely influencing the economy and human health of the entire society. In this work, novel porous polymer fibers with high spectral selectivity and their woven textiles were fabricated for passive human body cooling through combining the nanoscience and melt spinning technology with in-situ microfibrillar method. Because of strong emitting of mid-infrared and reflection to solar irradiation, the optimized porous PVDF textile could cool the human body by 17.7 oC under direct solar irradiance, 4 and 2 times the cooling capability of pure PVDF fiber and cotton, respectively. Indoor measurement shows that the optimized porous PVDF textile provided the human body with an almost the same thermal comfort as bare skin and enable the human body to avoid overheating by 2.7 oC compared to cotton. In addition, the wearing comfort of the optimized porous PVDF textile was comparable to cotton. The porous PVDF fiber and textile are promising to be industrially fabricated and widely applied for personal thermal management.