The scrap iron used in micro electrolytic technology was from the waste of a fabrication plant, this behavior possessed an effect of treating wastes with processes of wastes against one another and the generated Fe2+ can be used in the Fenton oxidation process, Fe3+ generated from which can be linked up with the flocculation technology. So it was capable of cutting down the cost and improving the treatment effect using micro electrolysis coupling with Fenton oxidation-flocculation technology to treat medium pulping wastewater. pH is an important influencing factor of micro electrolysis, Fenton oxidation and flocculation, and in this study the influence of pH on micro electrolytic technology was studied firstly, the results showed that the removal efficiency of COD and chrominance reached 65% and 60%, respectively and the concentration of generated Fe2+ reached 157mg/L when pH was 4. Then the influence of pH on the Fenton oxidation process was studied, the results showed that without extra Fe2+, the removal efficiency of COD by Fenton process increased at fist and then decreased with the increase of pH, and the removal efficiency of COD and chrominance reached 84% and 83%, respectively, and the concentration of generated Fe3+ reached 217mg/L at this moment. At last the study of the influence of pH on the flocculation effect with generated Fe3+ and PAM was carried out, the results showed that the COD removal efficiency reached 41% and the chrominance removal efficiency reached 75%, the final chrominance was 4 and the COD concentration was 45mg/L which was lower than 60mg/L, that met with the first order of effluent standard.