Activated aluminum hydroxide is a surface treatment of aluminum hydroxide with silane or titanate coupling agents. The product has high fineness, narrow particle size distribution, good flame retardant effect, high whiteness, low bulk density, and is stable at room temperature. Active aluminum hydroxide can improve the bonding and processability of aluminum hydroxide and resin, making it both flame retardant and filling, giving the product excellent comprehensive properties. Therefore, adding this product to advanced composite materials such as plastics and rubber not only makes the product have flame retardant, smoke reduction, self-extinguishing effects, but also enhances leakage resistance, arc resistance, and wear resistance. It can be widely used in electrical LDPE cable material, rubber, wire, cable insulation layer, sheath layer, thermal insulation material, conveyor belt, etc.