Abstract: A roofing sailcloth for a building includes a substrate of woven cloth, anti-slipping material woven to the substrate to increase surface roughness of a face of the substrate, and a leakproof layer bonded to the other face of the substrate. The roofing sailcloth is waterproof and leakproof and has high tensile strength and high tearing strength. Furthermore, the roofing sailcloth has improved anti-slipping effect to allow a worker to walk on the sailcloth safely and easily. Furthermore, the roofing sailcloth is light and allows easy transport to improve constructing efficiency. Furthermore, the roofing sailcloth possesses excellent anti-aging properties.