Domestic combustible gas alarm

The utility model relates to a household flammable gas alarm device which comprises a direct-current voltage-stabilized power supply, a gas sensor, a potentiometer, a voltage comparison system and an external device, wherein, the potentiometer comprises an early-warning potentiometer and a warning potentiometer, the early-warning potentiometer and the warning potentiometer are respectively connected with the output terminal of the gas sensor, and different reference points are provided for the voltage comparison system; and the external device comprises an early-warning device and a warning device, the output terminal of the voltage comparison system is respectively connected with the early-warning device and the warning device, and the alarm device can realize early warning and warning in sequence so as to avoid the false alarm.