Abstract: The present invention relates to polymer beads having a water-insoluble inorganic compound encapsulated therein, and their preparation method and use. In the present invention, the water-insoluble inorganic compound which has limitations on its use because of the characteristic of precipitates in an aqueous solution is encapsulated in the polymer beads. This encapsulation provides an increase in the utility of the water-insoluble inorganic compound and at the same time, imparts the activity of the water-insoluble inorganic compound to the polymer, thus increasing the function of the polymer. Accordingly, the polymer beads having the water-insoluble inorganic compound encapsulated therein, which are prepared by the inventive method, can be advantageously used in various fields, including medical and electronic industries.