Efficient and convenient methods for the removal of toxic heavy metal ions especially Cd(II) and Pb(II) from aqueous solutions is of great importance due to their serious threat to public health and the ecological system. In this study, two magnetic metal-organic frameworks (namily: Fe₃O₄@ZIF-8, and Fe₃O₄@UiO-66–NH₂) were synthesized, fully characterized, and applied for the adsorption of Cd(II) and Pb(II) from aqueous solutions. The adsorption efficiencies for the prepared nanocomposites are strongly dependent on the pH of the aqueous solution. The maximum adsorption capacities of Fe₃O₄@UiO-66–NH₂, and Fe₃O₄@ZIF-8 at pH 6.0 were calculated to be 714.3 mg·g¹, and 370 mg·g¹ for Cd(II), respectively, and 833.3 mg·g¹, and 666.7 mg·g¹ for Pb(II), respectively. The adsorption process follows a pseudo-second-order model and fit the Langmuir isotherm model. Moreover, the thermodynamic studies revealed that the adsorption process is endothermic, and spontaneous in nature. A plausible adsorption mechanism was discussed in detail. The magnetic adsorbents: Fe₃O₄@ZIF-8, and Fe₃O₄@UiO-66–NH₂ showed excellent reusability, maintaining the same efficiency for at least four consecutive cycles. These results reveal the potential use of magnetic Fe₃O₄@ZIF-8, and Fe₃O₄@UiO-66–NH₂ as efficient adsorbents in removing Cd(II) and Pb(II) from aqueous solutions.