Abstract: This invention relates to an electric flush tank designed for replacing the conventional mechanical flush tank, wherein a button switch attached to the outer wall of the water tank controls a solenoid which drives a connecting rod that in turn controls the water outlet. A microswitch installed on the connecting rod activates normally open switch B and forms normally open switch B normally closed switch D and a sustained circuit of said solenoid. A floating ball drives normally open switch A and normally closed switch D installed on the end of the connecting rod, in accordance with the rise and fall of water level. When the water is at its normal level, switch A is open and switch D is closed.