The present invention and outside and relates to a smart gas safety breaker to automatically cut off the valve of the gas, in the case of a housing, a power failure, including a front deopgaegwa main battery that provides power to perform the auto-lock function and, communicating with the kitchen TV multiple sensors of the detection signals received by MCU (Main Controller Unit) for driving this motor by the control signal receives the control signal of the kitchen TV transmission in the kitchen TV, and by the control of the kitchen TV to mounted on the fuse cock a driving gear consisting of a gear and the transmission gear operating portion to rotate, and the gear transmission portion functioning connection that transmits the rotation to the gear and motor operation part including a motor for providing the rotational movement to the connecting gear, a gas circuit breaker is set if more than a predetermined time the gas flows and the ultrasonic sensor to detect a gas flow error, and the electrostatic sensor, which does not applied for a predetermined time the main power supply is set detects a power failure, the external temperature to the predetermined temperature or higher set the If the rise and the external temperature sensor that detects a fire, characterized in that the gas when leaking out or cooking at stations or pot of broth overflow is generated containing them outside the gas detection for detecting the external leakage of the gas sensor It relates to smart gas safety breaker.