In this study, an anti-aging composite fabric termed FINM has been developed, exhibiting effective passive daytime radiative cooling capabilities. FINM possesses abundant silica-air contact surfaces and Si-O bonds, leading to high solar spectral reflectance and mid-infrared spectral emissivity. Under direct sunlight, FINM achieves a temperature reduction of 7-8 °C compared to a control without relying on silver or aluminum foils as background layers, yielding an average radiative cooling power density of 66 W/m². The inorganic nature of FINM, combined with an electrospinning fabrication process, imparts excellent flexibility, mechanical properties, and durability, making it suitable for building applications where passive heat dissipation is desired. Unlike photonic crystals, organic films, and coatings, FINM is characterized by a simple, cost-effective, and scalable production process, offering durability and efficiency for mass production. This work introduces a novel fabrication method for inorganic radiative coolers, providing new insights into achieving enhanced daytime passive radiative cooling performance using inorganic materials.