NOVELTY - A microbial fuel cell device has a cathode groove (1) and an anode groove (2) that are divided by a separator (3). A lower part of the separator includes a plate-shaped through-hole. The cathode groove includes a cathode electrolyte and a cathode electrode (8). The anode groove is internally provided with an anode electrolyte and an anode electrode (9). The anode electrode, an external resistor (5) and the cathode electrode are connected through a wire (4). A part of an upper part of the cathode groove and the anode groove is planted with a high aquatic plant (6).    USE - Microbial fuel cell device for an artificial wetland aquatic plant electrode.    ADVANTAGE - The device reduces planting cost of the high aquatic plant, avoids a need to use an expensive selective permeable membrane for the whole device, reduces manufacturing cost, and purifies poisonous liquid contaminant when working in sewage treatment. The device has long operation period, simple maintenance, strong decontamination capability, pollutant degradation effect, and makes full use of solar energy for generating electricity power.    DETAILED DESCRIPTION - A microbial fuel cell device has a cathode groove (1) and an anode groove (2). The cathode groove and the anode groove are divided by a separator (3). A lower part of the separator is provided with a plate-shaped through-hole. The cathode groove is internally provided with a cathode electrolyte and a cathode electrode (8). The anode groove is internally provided with an anode electrolyte and an anode electrode (9). The anode electrode, an external resistor (5) and the cathode electrode are connected through a wire (4). A part of an upper part of the cathode groove and the anode groove is planted with a high aquatic plant (6).    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a microbial fuel cell device.    Cathode groove (1)    Anode groove (2)    Separator (3)    Wire (4)    External resistor (5)    High aquatic plant (6)    Cathode electrode (8)    Anode electrode (9)