This is a new type of combined carbon monoxide sensor module that solves the unique technical problems of sensors such as flexible use of gas sensors and independent sensitivity adjustment, and can quickly develop a carbon monoxide alarm in a short period of time. It has excellent durability and long-term stability, which is equipped with an electrochemical carbon monoxide sensor TGS5042 developed by Figaro and has been widely used in the field of household and commercial carbon monoxide alarms.