PBMA/GMA-SiO2 adsorbent was synthesized via RAFT polymerization by using butyl methacrylate(BMA) and GMA -functionalized silica particles as monomers. The effects of pH,contact time and initial Pb2+ concentration on adsorption properties were evaluated, as well as adsorption thermodynamics and kinetics were also examined. The results show that the PBMA/GMA-SiO2 adsorbent was effective for Pb2 removal from water, the maximal adsorption capacity for Pb2+ was found to be 423.84 mg/g, the optimum pH value for Pb2+ removal is 5 to 6, and absorption time is 1 h, the removal efficiency increased with the decreasing of initial Pb2+ concentration. Under optimized conditions, 50 mg sorbent could remove 100% of Pb2+ from 50 mL 0.02 g/L Pb2+ solution at pH = 6 and 298K. The adsorption kinetics could be best described by pseudo second-order kinetic model, compared with the Freundlich isotherm equation, the Langmuir isotherm equation is more appropriate to describe the adsorption behavior. The adsorption rate is not only controlled by intra-particle diffusion but also by extra-particle diffusion. Besides, the materials still show good adsorption capacity to Pb2+ after five times of desorption and adsorption.