Due to expensive costs in wastewater treatment, humic acid (HA) functionalized onto Fe₂O₃ magnetic nanoparticles (FeMNPs-HA) was synthesized in this study to remove Cr^-6 and Pb⁺²from wastewater. FeMNPs-HA was synthesized by the co-precipitation method for cheap and eco-friendly materials. FTIR and TGA were used for the characterization of FeMNPs-HA. FTIR showed similar bands for both HA and MNPs-HA and this indicated that HA was successively functionalized at FeMNPs. Moreover, TGA analysis showed high stability of material synthesized, since loss of weight began over 600 °C. Batch adsorption experiment was conducted to state the optimum conditions for removal of positive and negative ions (Pb⁺² and Cr^-6) from the aqueous solution using FeMNPs-HA. Adsorption of the studied metals onto FeMNPs-HA reached equilibrium in less than5 minutes, whereas the adsorption process wasn't affected by pollutants concentrations. Langmuir adsorption model was suitable to explain the sorption process of Pb⁺² and Cr^-6 onto MNPs-HA with maximum adsorption capacities reached 99.99 mg g^-1. The FeMNPs-HA proved to has the capability for elimination more than 99% of Cr^-6 and Pb⁺² from the wastewater at optimized pH. Synthesized material was applied for toxic metals elimination from industrial wastewater (IWW), FeMNPs -HA showed high removal efficiency for Cd, Cr and Ni. Based on the adsorption data; FeMNPs -HA could be considered as an efficient material for wastewater purification from heavy metals regardless their charge.