Nowadays, all efforts aspire to develop the textile finishing using environmentally safe, bio-degradable, and more efficient green materials from biological sources such as the use of plant extract instead of chemical that harm environment and human health. In this article, discussion of organic Cellulose nanocrystals (CNCs) as green finishing material to produce Multifunctional textiles such as antimicrobial , uv protection, Hydrophilic modification, flame retardant and insects repellent in addition to several products such as filter paper and face mask and antimicrobial wound dressing films depended on (CNCs) that have valuable qualities like high stiffness, high surface area, and good mechanical properties. They are crystalline in nature and have a rod-like nano-shaped structure. (CNCs) are extracted in large quantities from natural cellulose sources, such as wood, tunicate, Red Algae, Bamboo, Bacteria, phormium tenax or agriculture wastes, among others. Their highly distinctive qualities, which include low cost, biodegradability, dye sorption, and ubiquitous metallic ionic nature, have been used to manipulate chemicals with high sensitivity and combine various critical parameters, including high mechanical strength and low density in various aspects, making them ideal for incorporating with various materials and bonding with hydrophilic polymers. Additionally, their biological sustainability, bioavailability, and low cytotoxicity make them a preferred choice for scientific and technological advancements across a range of fields.