Abstract: A leak-proof toilet tank, includes a toilet tank, a water-supply valve, a float cup, a float and a sealed drain device; wherein, the float cup has a sealed bottom. When the water supply is filled to the toilet tank, the water level raises up to make the float blocking the water supply. When leaks water leakage, the float cup does not leak water because of the sealed bottom, and the water level is not changed, further maintains the float to the predetermined position. The present disclosure further provides a passway for supplying water to the float cup. Even if water leakage happens, the float can be pushed to block the water supply by filling the water in the sub-tank into the float cup or by supplying water directly by the water supply pipe, so that reaching the effect of leak-proof of the toilet tank.

Abstract: A leak-proof toilet tank, includes a toilet tank, a water-supply valve, a float cup, a float and a sealed drain device; wherein, the float cup has a sealed bottom. When the water supply is filled to the toilet tank, the water level raises up to make the float blocking the water supply. When leaks water leakage, the float cup does not leak water because of the sealed bottom, and the water level is not changed, further maintains the float to the predetermined position. The present disclosure further provides a passway for supplying water to the float cup. Even if water leakage happens, the float can be pushed to block the water supply by filling the water in the sub-tank into the float cup or by supplying water directly by the water supply pipe, so that reaching the effect of leak-proof of the toilet tank.