A water stoppage structure utilized in a water purifier filter core, comprising a filter core main body, provided with a water input port, a first water output port, and a second water output port; a filter core, disposed in the filter core main body; a seat body, disposed at one end of the filter core main body, matching and working in cooperation with the water input port, the first water output port, and the second water output port of the filter core main body; a first check valve, disposed at the water import port, and on a water channel leading to the filter core main body, for allowing water to pass only through the filter core main body; a first water passage switch valve, disposed on the second water output port; and a second water passage switch valve, disposed on the first water output port.