Abstract: The adsorption behavior and mechanism of a novel thiol-resin for Ag(Ⅰ) were investigated. Experimental results showed that the statically saturated sorption capacity was 639 mg•g^-1resin at pH=4.5 in the HNO₃-NaAc medium. Ag(Ⅰ) adsorbed on the thiol-resin could be eluted with (5%～10%) (NH₂)₂CS—1.0mol•L^-1 HCl and elution percentage was over 95%.The resin could be regenerated and reused without apparent decrease of adsorption capacity. The adsorption behavior obeyed the Freundlich isotherm. The apparent adsorption rate constant was k_25℃=1.56×10^-5s^-1 .The enthalpy change ΔH of sorption was 40.2kJ•mol^-1.The functional group molar ratio to Ag(Ⅰ) was about 1∶1 and the mechanism of adsorption was examined by IR spectrometry.