<p>The incorporation of semiconductor materials on Fe₃O₄ has been demonstrated as an efficient way to promote the photocatalytic activity of Fe₃O₄. Therefore, we synthesized Fe₃O₄@In₂S₃ composite by growing ultrathin In₂S₃&#xa0;nanosheets on the surface of Fe₃O₄ using a simple one-pot water bath heating method. Fe₃O₄@In₂S₃ exhibited high adsorption and photoreduction capacities for Cr(VI) under wide pH, as well as excellent magnetic separation property. Meanwhile, the adsorption and reduction ability of Fe₃O₄@In₂S₃ towards Cr(VI) maintained high level in low-valent anions system, while it significantly declined with existence of high-valent anion (PO₄³⁻). A sharp contrast between the two situations manifested that the Fe₃O₄@In₂S₃ has strong anti-interference in low-valent anions system. Furthermore, cyclic experiments revealed the admirable photocatalytic activity and reusability of Fe₃O₄@In₂S₃. According to the results of adsorption and cyclic experiments, a distinctly enhanced proportion of Cr on surface of Fe₃O₄@In₂S₃ in the first cycle experiment was observed, which indicated that the photocatalytic reduction of Cr(VI) probably promoted the immobilization of Cr species on Fe₃O₄@In₂S₃. XPS analysis results suggested that the Cr(VI) loaded on Fe₃O₄@In₂S₃ mostly reduced to Cr(III) via photocatalytic reduction process with In₂S₃, and Fe₃O₄ partly contributed to its reduction. Finally, the enhanced adsorption and reduction capacity of Fe₃O₄@In₂S₃ for Cr(VI) and its easy recycling feature make it has great application potential in Cr(VI) wastewater treatment.</p>