Abstract: Active montmorillonite adsorption material(A_X-MMT) was obtained by activating montmorillonite with hydrogen peroxide. The activated samples were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), transmission electron microscopy(TEM), scanning electron microscopy(SEM), specific surface analysis(BET) and surface Zeta potential analysis. The effects of concentration of hydrogen peroxide, pH value, contact time and coexisting anions and cations on U(Ⅵ) adsorption on A_X-MMT were investigated by static batch experiment. Under the optimum conditions(concentration of hydrogen peroxide, pH value and contact time are 10%, 6 and 24 h, respectively), the adsorption percentage of U(Ⅵ) on montmorillonite increases by 8.5 times, which accords with the quasi-second-order adsorption kinetics model. Under the interference of both anions and cations, H₂O₂ activated montmorillonite can also exhibit good adsorption properties for U(Ⅵ).