Infrared gas sensor

The utility model discloses an infrared gas sensor which comprises a gas chamber, an infrared lamp arranged in the gas chamber, an infrared detection element, an integrated circuit board and a pin assembly, the infrared lamp and the infrared detection element are respectively arranged on the integrated circuit board; the pin assembly is arranged on the lower side of the air chamber; infrared light emitted by the infrared lamp is continuously emitted in the air chamber and finally reaches the infrared detection element; the infrared detection element is a thermopile detector assembly; the thermopile detector is formed by connecting a plurality of thermocouples in series. The infrared detection element is a thermopile detector assembly and an element capable of mutually converting temperature difference and electric energy, when the thermopile detector assembly is used for measuring temperature change, the defect that the potential difference generated by a single thermocouple is too small and is difficult to m