A novel Br(I) ion-imprinted polymer was prepared for selective extraction of Br(I) ions from aqueous solution. Chitosan modified by aluminum nitrate and glutaraldehyde were selected as the monomer and cross-linking reagent. The effects of cross-linking reagent dosage, cross-linking time, and aluminum nitrate dosage on the adsorption performance of prepared polymers were studied. The prepared polymers were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and zeta potential. The results confirmed the successful cross-linking and polymerization of both Br(I)-IIPs and nonimprinted polymers. The effects of adsorption conditions like pH, adsorption time, and initial Br(I) concentration on the adsorption performance of Br(I)-IIPs were investigated too. The maximum adsorption capacity of Br(I)-IIPs reached up to 18.89 mg g(-1) with the initial Br(I) ion concentration of 100 mg L-1 at pH 4. Freundlich isotherm and pseudo-second-order kinetic models are suitable for describing the adsorption process of Br(I)-IIPs. The prepared Br(I)-IIPs showed a high relative selectivity for all Br(I)/competing ions. The prepared polymer also had good reusability.