Abstract: The present invention is to provide a method for regenerating inorganic porous particles, a method for purifying water and a continuous water purification device, which can be easily applied as a recycling system of water in special environments such as space environment, by safely removing impurities contained in water and water vapor with a usage of a compact facility without using any chemicals. The method for regenerating inorganic porous particles is characterized in that adsorbed products such as ammonia and/or amines, are reduced by heating to 100-200° C. under a reduced pressure of 10 Pa or less. The method for purifying water and the continuous water purification device are characterized in that a dense membrane having cationic groups and/or a composite membrane in which a hydrophilic membrane is layered on a surface of a hydrophobic porous membrane is used as a permeable membrane are used as a permeable membrane.