Heavy metals have become a major concern for the community and government. These heavy metals are dangerous substances due on there big effect to human, plants, and farm health. In this research, we focused on Lead (Pb) as the heavy metal sample. Pb ions were absorbed using magnetic nanoparticle Fe3O4 material. Magnetic properties and nanosize of the nanoparticles have been confirmed to absorb heavy metal. Fe3O4 nanoparticle can adsorb Pb heavy metal up to reach 99.98% on concentration mass absorbant variation of 0.56 gram to 0.70 gram.