Purification processing device

A purification processing device includes a container for receiving a liquid, a gas diffusion electrode, an electrolytic electrode and a power supply unit. The sidewall of the container has an opening, and the gas diffusion electrode is disposed on the sidewall to seal the opening. The gas diffusion electrode is porous conductive material. One side of the gas diffusion electrode facing to the container is hydrophobic and a catalyst layer is coated on the side. Another side is air permeable for allowing the oxygen in the exterior of the container into the gas diffusion electrode. The electrolytic electrode is disposed in the container. The power supply unit has one end electrically connected to the gas diffusion electrode and another end electrically connected to the electrolytic electrode for electrolyzing the liquid. The gas diffusion electrode makes the oxygen entering the container and reacting with the hydrogen ions generated in the electrolyzed liquid to generate hydrogen peroxide. The catalyst layer mak