Characterization of waste activated sludge of crumb rubber industry (CRI-WAS) as adsorbent of Cd(II) from aqueous solution had been done. The sludge is discarded as waste from wastewater treatment processing, and expected to be an economical adsorbent for metal ion remediation from water and wastewater. The FTIR, XRF and SEM-EDX analysis were conducted to characterize the CRI-WAS. Batch adsorption experiments were carried out to investigate the effects of pH solution, dosage of adsorbent, and contact time. The results showed that Adsorbent developed from waste activated sludge of crumb rubber industry (CRI-WAS) containing high silica and alumina and also has an abundant functional groups. The optimum adsorption of Cd(II) was found at pH 5, dose 0.5 g, and contact time 210 minute with the maximum adsorption capacity was 30.38 mg/g.