To improve adsorption capacity of montmorillonite on Pb(II),porous montmorillonite(PM) is prepared using CaCO3 porogen and Na-montmorillonite material. The properties of PM are characterized by scanning electron microscopy(SEM) ,fourier transform infrared spectrum (FTIR) and X-ray diffraction(XRD),the adsorption properties on Pb(II) are discussed.The experimental results show that PM has abundant pores;With the increase of PH value,adsorption capacity by PM on Pb(II) increases first and then decrease at 25℃，and the adsorption capacity is the highest when initial pH is 5.5;The adsorption process accords with the pseudo-second order Kinetics model; The adsorption isotherm accords with Langmuir equation, the saturated adsorption Capacity is 143.5 mg·g-1 at 25℃,when pH is 5.5.