Abstract: In this paper, Cr₂(SO₄)₃ was used as simulated Cr-containing waste water to investigate the removal effect of Cr by electrocoagulation. The results of constant voltage electrocoagulation experimentals show that Al anode is more suitable for electrocoagulation than Fe anode. The optimal conditions for the treatment of Cr₂(SO₄)₃ by Al anode electrocoagulation are as follows: current density 350 A/m², electrolyte concentration 15 g/L, initial pH 4.5, and time 90 min. The Cr removal rate reached 99.86 % and the Cr content was reduced to 3.39 mg/L. The current efficiency analysis shows that the current efficiency of Al anode electrocoagulation is low, and the current density has little influence on the current efficiency. The Al anode electrocoagulation method can achieve a good effect of Cr separation from solution, which provides a new idea for the recovery and utilization of Cr resources in Cr-containing waste water.