Cadmium(Ⅱ), plumbum(Ⅱ), and chromium(Ⅵ) universally co-exist in the environment, greatly aggravating their environmental risks and elevating the difficulty of remediation. Herein, a novel sodium dodecyl sulfate modified attapulgite clay-supported nano zero-valent iron (SDS@ATP/nZVI) was exploited as the synchronous adsorbent of Cd(Ⅱ), Pb(Ⅱ), and Cr(Ⅵ) composite pollution. With the aid of the carrier SDS@ATP, nZVI was highly dispersed and became the primary active ingredient. The adsorption kinetics results showed that there existed a strong competitive effect between Cd(Ⅱ) and Pb(Ⅱ), while the co-existence of Cr(Ⅵ) accelerated the removal of Cd(Ⅱ) on SDS@ATP/nZVI. The adsorption capacity (q