NOVELTY - Treating organic wastewater from microbial fuel cell constructed wetlands using a system is claimed, where the system comprises an artificial wetland provided with a multi-media filter bed for planting emergent plants in a wetland region. An aeration pipe and an exhaust pipe are fixed on two sides of the multi-media filter bed. An inflow water distribution zone and a stream catchment are connected to a water supply system and a drainage system. A water distribution inflow area is fixed with the stream catchment and connected to a reflux system.    USE - The method is useful for treating organic wastewater from microbial fuel cell constructed wetlands to produce electric energy.    ADVANTAGE - The method is capable of removing organic matter in wastewater from microbial fuel cell constructed wetlands in a cost effective and eco-friendly manner with less energy consumption.    DETAILED DESCRIPTION - Treating organic wastewater from microbial fuel cell constructed wetlands using a system is claimed, where the system comprises an artificial wetland provided with a multi-media filter bed for planting emergent plants in a wetland region. An aeration pipe and an exhaust pipe are fixed on two sides of the multi-media filter bed. An inflow water distribution zone and a stream catchment are connected to a water supply system and a drainage system. A water distribution inflow area is fixed with the stream catchment and connected to a reflux system. The reflux system is formed with a bentonite layer that is passed through an upper aerobic zone and a lower anaerobic zone of the multi-media filter bed. The upper aerobic zone and the lower anaerobic zone are provided with a piece of graphite felt. The organic sewage is passed into the lower anaerobic zone through the water supply system and the water distribution zone. The lower anaerobic zone acts as an anode chamber for microorganism oxidation in organic matter by producing electrons and protons. The electrons are passed through the lower anaerobic zone through the graphite felt. The graphite felt is passed through an external circuit in a cathode compartment of the upper aerobic zone. The protons are passed through the bentonite layer. The upper aerobic zone discharges the water contained in the gas through the exhaust pipe. The exhaust pipe is extended into the lower anaerobic zone. The upper aerobic zone acts as a cathode chamber. The aeration tube supplies oxygen to the emergent plants. The water passes from the lower anaerobic zone to a reflux and inflow water distribution system and an upper aerobic zone for degradation of organic contaminants from the stream catchment. The bentonite layer covers a middle part of the artificial wetland. An outer circuit is connected with a graphite felt lead. The graphite felt is connected between an upper layer aerobic area and the lower anaerobic zone, and serially connected with a load. Two ends of the load are connected with a circuit monitoring unit or an electric energy output device. The aeration pipe is a perforated PVC pipe having diameter of 5 cm and extended into the upper aerobic zone. The exhaust pipe is a PVC pipe having diameter of 5 cm. A lower part of the exhaust pipe is set with a valve. An upper part of the exhaust pipe is extended to the lower layer anaerobic area. The emergent aquatic plant is reed or canna plant, and planted at the rate of 10-20 reed/m2 or 3-4 canna plants/m2. The roots are distributed on the upper layer aerobic zone. The inflow water distribution area and the outflow water distribution area are fixed with a PVC porous plate that is filled with gravel filler having particle size of 9-15 mm. The multi-media filter bed is filled with sulfate stone and sand having particle diameter of 5-8 mm.