Foam additive is a suspension containing graphene and common foaming liquid, such as polypropylene glycol (PPG). Thanks to the lipophilicity of graphene, the foam can be used as a water/oil separator to absorb oil, to filtrate the solid residue, and then to facilitate the water and oil recycling. In addition, due to the presence of graphene, the foam possesses the properties of anti-static, heat dissipating, and anti-collision.