A novel sorption extraction stir bar（SBSE） based on the polymer monolithic material was prepared by in situ stepwise polymerization of epoxy resin（EP） and diethlenetriamine（DETA） using polyethylene glycol（PEG 1540） as porogen. The SBSE was used for the adsorption and extraction for Cd ion in environmental water sample. The experimental conditions such as pH value，stir rate，extraction time，desorption solution and time were optimized. The SBSE operation was performed at a stirring rate of 300 r/min at pH 60 for 30 min，and the desorption was done in 5% HNO3 for 10 min. The concentration of Cd ion was detected by ICP-AES method. The result indicated that the calibration curve showed a good linear relationship in the Cd concentration range of 01-50 mg/L with a correlation coefficient of 0997 2.The relative standard deviation and detection limit(3σ) were 46%and 38 μg?L-1, respectively， and the recoveries ranged from 97% to 104%. The method could be applied to the determination of Cd ion in environmental water samples with good reproducibility and reliability.