Ti₃C₂T_x MXene is a potential adsorbent of heavy metal ions due to its two-dimensional layered structure and abundant surface functional groups. However, it has disadvantages of limited layer spacing and poor stability in aqueous solution. Here, the modification strategy of Ti₃C₂T_x was explored to improve its chemical stability and ion adsorption capacity among which Fe₃O₄-Ti₃C₂T_x(FeMX) adsorbent with different doping amounts of Fe₃O₄ were prepared by one-step hydrothermal method. The results showed that the maximum theoretical Pb(II) adsorption capacity of FeMX adsorbent could reach 210.54 mg/g. Its adsorption mechanism was further revealed that Fe₃O₄ nanoparticles were evenly dispersed and intercalated between Ti₃C₂T_x nanosheets, which effectively increased specific surface area and layer spacing of Ti₃C₂T_x nanosheets, leading to improving Pb(II) removal ability. Therefore, this study provides a promising route for developing MXene matrix composites with excellent heavy metal ion adsorption properties.