The invention relates to a button detecting device of a gas stove and the gas stove. The button detecting device comprises a button state detecting circuit and a power supply control circuit, whereinthe button state detecting circuit is used for connecting a power supply battery of the gas stove to a button switch; the power supply control circuit is connected to the button state detecting circuit, and is further connected to the power supply battery and a controller of the gas stove. The button state detecting circuit is used for detecting a state of the button switch, and outputs electric level of the corresponding type to the power supply control circuit, so that the power supply circuit stops supplying power to the controller of the gas stove while the button switch is in an open state, and accesses voltage output by the power supply battery for supplying power to the controller while the button switch is in a closed state, and therefore, the controller can be ensured to normallywork. While the gas stove is in a standby state and the button switch is in the open sate, the power supply control circuit enables the controller to not electrify, so that the controller does not consume power while the gas stove is in the standby state, and therefore, power consumption of the gas stove is reduced, and the service life of the power supply battery is prolonged.