Abstract: 1 - sulfonic acid cyclohexane carboxylic acid was purified by activated carbon adsorption—acid precipitation. Effects of activated carbon dosage ,solution pH, adsorption time and final ph value on 1 - sulfonic acid cyclohexane carboxylic acid purification process were studied. the results show that, at pH 6 of coarse salt solution, using activated carbon as adsorbent, addition quantity of activated carbon 1.0 g,the adsorption time was 60 min,dropped concentrated sulfuric acid to final ph value was 3, the purity of 1 - sulfonic acid cyclohexane carboxylic was extracted reached 99.8%, and the yield reached 84.8%.