Abstract: The active carbon (AC) was grinded by self-made rolling vibromill, and the morphology, specific surface area and pore diameter of the grinded AC were observed. The domestic sewage was treated by iron-carbon microelectrolysis and the influences of sewage pH value, mass ratio of iron and carbon, reaction time and H2O2 dosage on COD removal rate were studied. The results show that the grain diameter decreased to 1-2 μm and specific surface area increased by 27% after AC was grinded. The COD removal rate could surpass 70% ,which was superior to that of unground AC surface, when sewage pH value was 3.0, H2O2 dosage was 400 mg·L-1 and reaction time was 180 min. The COD removal mode conformed to first order reaction kinetics rule.