Silk carpet nano-protectant forms a molecular-level ultra-thin (10–50 nm) hydrophobic and oleophobic coating on silk/wool/cashmere fiber surfaces via spray or dip processes using nano-SiO2/fluorocarbon silane (5–15 nm, surface energy <20 mN/m). Nano-particles self-assemble along the fiber surface—Si-OR hydrolyzes to Si-OH—condenses with hydroxyl/amino groups of silk fibers—Si-O-fiber covalent bonding anchors—CF3/CF2 or long-chain alkyl groups orient outward—extremely low surface energy—water droplets (surface tension 72 mN/m) and oil droplets (20–35 mN/m) roll off the coated surface as spheres. Resists red wine (containing strongly staining tannins and anthocyanins)/coffee/soy sauce/cooking oil/cosmetics—spherical surface—easily removed completely by lightly blotting with tissue—zero residual penetration. Preserves original silk luster (20° gloss change <2 GU) and soft handfeel (bending stiffness change <10%). 2025 trend: PFAS-free alternatives (long-chain silane + nano-SiO2 + PDMS) deliver performance close to fluorocarbon systems (contact angle difference <5°). Global luxury textile care market approx. $1.2 billion (2025), CAGR 5.5%. Meets ISO 105-E01, AATCC 118, ISO 105-X12 standards.