Abstract: An outdoor water purifier using a ceramic filter is disclosed. The outdoor water purifier is installed in home water pipes or water supply pipes for various industrial purposes to sterilize water and improve water purity. The outdoor water purifier includes a water gauge that measures the flow of tap water to calculate the water use rate, a filter connected to the water gauge for filtering tap water, a filter alarm that measures the state of the filter, and an RF transmitter connected to the filter for wirelessly transmitting data of tap water use rate according to the amount of tap water used. The filter is installed to a water supply pipe and configured in such a way that a carbon layer, a ceramic layer, an antibacterial layer, and a fine ceramic layer, stacking from the top thereof, in order to improve taste and to remove odor and bacteria contained in raw water.