A novel bioelectro-Fenton microbial fuel cell (BEF-MFC) cathode has been fabricated by modification of electrode using multi-processing of nitrogen-doped carbon (NDC)/nano-Fe3O4 method with the aims of cost-effectiveness, high oxygen reduction reaction (ORR) efficiency, and power performance enhancement. In this study, BEF-MFC with carbon cloth (CC) cathode pyrolyzed with NDC-M100/Fe3O4 at 700 degrees C achieved higher ORR activity compared with the commercial Pt/C under same operational conditions. It also exhibited excellent crystalline structure according to high-resolution transmission electron microscope (HRTEM) analysis. Moreover, using NDCN/Fe3O4 can facilitate further Fenton-like reaction for the treatment of wastewater. Chemical oxygen demand (COD) removal efficiency of the reactor was 78% with maximum power density of 1.57 W/m(3) in 216 hours. Thus, an innovative multi-processing method with feasibility for enhanced wastewater treatment and improved power performance of the MFC was investigated. This can be effectively applied in related alternative energy production techniques and bio-electrochemical systems in the future.