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This utility model relates to the field of water purification technology, and more particularly to a slow filtration water purification device based on a biofilm attached to activated carbon. It includes a first shell and a second shell, connected by a connecting pipe. The first shell contains an activated carbon-coated felt anode layer and an activated carbon-coated felt cathode layer. Both the first and second shells contain a quartz sand-modified activated carbon layer. A ring-shaped water distributor is positioned above the quartz sand-modified activated carbon layer, and a lower pad layer is positioned below it. An ultraviolet lamp is also installed inside the second shell. This utility model, by attaching a biofilm to the surface of activated carbon, utilizes the metabolic and biodegradation capabilities of microorganisms. Simultaneously, it combines the treated water flow with the activated carbon, and through the synergistic effect of the biofilm and adsorption, improves the removal rate of harmful substances in the water, enhances the removal capacity for various pollutants, and improves water purification efficiency and quality.