Aramid activated fiber is to introduce amino, hydroxyl, carboxyl and other active or polar groups on the surface of aramid fiber through chemical reaction, and improve the bonding strength between fiber and matrix through chemical bonding or polarity. The product greatly enhances the adhesion between aramid products and rubber, and disperses evenly to enhance the friction resistance, high temperature resistance and corrosion resistance of rubber. Suitable for automobile tire, automobile hose, industrial transmission belt and other rubber products field.