The present invention relates to a water-oil separation device using the difference in density between water and oil, and more particularly, a water-oil separation device that can easily and quickly separate oil by using a polymer film floating at the interface between water and oil. It is about. The water-oil separation device according to the present invention does not use the existing lyophilic/lyophobic film, but utilizes the difference in density of the material. It solves the drawbacks of the filter method and adsorption method of the study at the same time, and it is possible to quickly and effectively cope with the actual oil spill situation.
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