Disclosed is a preparation method of weakly basic, ionized, mineralized and healthy drinking water including purifying the tap water by precipitation, filtration and other conventional methods to obtain clean water and getting the said clean water through reverse osmosis (RO) membrane to obtain RO pure water heating the said RO pure water to 35-100 degrees celsius by magnetic oscillation or by heating, and then making the RO pure water through weak alkaline, ionized, and mineralization composition, and then filtering the RO pure water by coconut carbon cartridge and PP cotton filter element in turn. The water prepared by the method of the present invention is beneficial to the health of human body and suitable for long-term consumption.
