Disclosed is a water savable flush toilet including a sealed water tank provided with a water discharge hole opened and closed by a ball-shaped closure disposed therein, a portion of the water tank being connected to a water supply tube and the water discharge hole being formed in a funnel shape; an opening device for opening the water discharge hole by moving the ball-shaped closure, the opening device being disposed in a water discharge tube connected to the water discharge hole, a toilet bowl connected to the water discharge tube to receive the water and provided at a bottom with a water/filth discharge hole on which a magnet is installed, and a bowl closure connected to the opening means by a wire supported on a roller to be opened to discharge water/filth through the water/filth discharge hole and to be closed by the magnet.