The invention discloses a sunlight fabric fiber for sun-shading of buildings. The sunlight fabric fiber comprises a core layer and a surface layer. The core layer is prepared from polyester fibers, the surface layer is prepared from PVC (polyvinyl chloride) composite materials, the PVC composite materials are prepared from phosphorus-nitrogen fire retardants and ethylene-vinyl acetate copolymers.The sunlight fabric fiber has the advantages that the synergistic interaction principle of the phosphorus-nitrogen fire retardants and the ethylene-vinyl acetate copolymers is utilized, so that the sunlight fabric fiber has excellent fire resistance performance and excellent mechanical property; antibacterial performance, ultraviolet resistance and color fastness can meet market demands; the sunlight fabric fiber, which can be made into sunlight fabric, is applicable to sun-shading of the buildings and has a wide application prospect.