In this paper, the removal behaviour of Zn2+ from aqueous solution by adsorption onto solidifying landfilled sludge and its mechanism were studied. The results showed that Zn2+ adsorption capacity reached optimum when initial pH was 3.0. When initial Zn2+ concentration was150mg/L, the removal efficiency could reach more than 90% with dosage of solidifying landfilled sludge being 6g/L. Moreover, the adsorption isotherm could conform to Freundlich equations best. The desorption ratio for adsorbed Zn2+ reached above 90% by HCl solution with pH value being 1.0, however, it was only about 10% despite of EDTA concentration. FTIR analysis showed that main site for Zn2+ adsorption onto solidifying landfilled sludge was Me-O group from metal oxide and hydroxyl group from fatty alcohol.