Household gas alarm

The utility model relates to a household gas combustible alarm, which comprises a gas sensor 2, a power supply circuit 3, an alarm circuit 4, a temperature/humidity sensor 5 and a display screen 6, wherein, the alarm circuit 4 comprises a single chip computer 41, a crystal vibration circuit 42 which carries out one-way connection with the single chip computer 41, an audible and visual alarm circuit 43, a heating circuit 44, a display drive circuit 45 which carries out double-way connection with the single chip computer 41, a storage 46, a resetting/testing circuit 41 and a power up/testing circuit 48. The inner part of the single chip computer 41 is solidified with a software program P. The device of the utility model has the audible and visual alarm of a common alarm, besides the utility model can also realize the liquid crystal digital display alarm according to temperature and humidity in current environment and the concentration of the combustible gas.