Abstract: Based on the preliminary experiment, 24 L laboratory online suspension electrolysis decontamination device was established, and the electrolytic decontamination formulation was determined. The experiments were carried with the simulated carbon steel and stainless steel samples, to determine the optimized suspension electrolysis decontamination formulation and process parameters. At the same time, through the electrochemical workstation, the electrochemical performance of online suspension electrolysis decontamination device, the relationship of the electrochemical properties and decontamination factors were studied. Under the optimal parameters and conditions, including the 0.6 mol/L H₂SO₄, 0.8 mol/L Na₂SO₄, 100 g/L suspension particle, 60 g/L abrasive particle, the 26 mL/s circulating flow, the 8 V electric voltage and the 5 m transmission distance, for the simulated carbon steel and stainless steel samples, after 1 h decontamination, their decontamination factor can reach 257 and 191.