In this paper, the principle of the iron-carbon micro-electrolysis method is introduced, the effects of the pH value, reaction time and ratio of iron to carbon on the wastewater treatment are investigated, and the optimal operating parameters are determined through a series of experiments to ensure that COD removal rate is as best as possible. The results show that the iron - carbon micro-electrolysis is the best when the pH value is 4, the iron-carbon ratio is 2: 3 and the reaction time is 1. 5 hours.