NOVELTY - A microorganism fuel battery-type ecological floating bed device comprises ecological floating bed comprises upper layer aquatic plant cell, middle layer aquatic cell, and lower layer fixed metal tray (5), in which upper layer aquatic cell contains floating aquatic plants (1) fixed on electrically conductive material (2), middle layer aquatic cell contains submerged aquatic plants (3) fixed on lightweight mesh (4), and electrically conductive material is connected to external circuit load (7) and wire (6) outside floating bed device to form microbial fuel cell air cathode electrode.    USE - A microorganism fuel battery-type ecological floating bed device for shallow surface water sediment and water body purification and biomass energy recovery (all claimed).    ADVANTAGE - Microorganism fuel battery-type ecological floating bed device is low-cost, electrically stimulates growth of bacteria, improves water quality and efficiency of organic matter removal, and does not cause secondary pollution.    DETAILED DESCRIPTION - A microorganism fuel battery-type ecological floating bed device comprises ecological floating bed comprises upper layer aquatic plant cell, middle layer aquatic cell, and lower layer fixed metal tray (5), in which upper layer aquatic cell contains floating aquatic plants (1) fixed on electrically conductive material (2), middle layer aquatic cell contains submerged aquatic plants (3) fixed on lightweight mesh (4), electrically conductive material is connected to external circuit load (7) and wire (6) outside floating bed device to form microbial fuel cell air cathode electrode, and anaerobic reduction reaction zone is formed by metal tray and sediment in anaerobic environment to form microbial fuel cell anode electrode.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram for microorganism fuel battery-type ecological floating bed device.    Floating aquatic plant (1)    Electrically conductive material (2)    Submerged aquatic plant (3)    Lightweight mesh (4)    Metal tray (5)    Wire (6)    External circuit load (7)