A method of treating and activating sea water or polluted water into drinking water comprising the steps of separating and removing impurities from sea water or polluted water containing a great amount of deleterious materials such as chlorine, various kinds of heavy metals, environmental hormones, and miscellaneous bacteria by an electrode located in a primary treating tank, then introducing sea water or polluted water subjected to the primary treatment into a filtration tank for filtration and further introducing filtered water into a secondary treating tank, releasing useful minerals by magnetic ores and providing active power to various kinds of useful organic materials remained not filtered in the treated water.