The invention discloses environment-friendly sound-absorbing cotton which comprises an upper surface layer, a middle layer, a lower surface layer and a base layer. The upper surface layer is made of glass fiber, the middle layer is made of alginate fiber, the lower surface layer is made of polyester fiber sound-absorbing cotton, the base layer takes quartz sand and limestone natural ore as main raw materials, some sodium carbonate is matched, and glass is fused to be blown into flocculent fine fibers in a molten state. The environment-friendly sound-absorbing cotton can achieve a very good attracting effect, and the used material is very environmentally friendly and free of pollution and smell.