Gas concentration detection device and system

The utility model provides a gas concentration detection device and a gas concentration detection system. Relating to the technical field of gas detection, the gas concentration detection device comprises a gas concentration sensor and a controller, the system comprises a central processing unit, an infrared driver, an infrared emitter, an infrared receiver and an infrared comparator. The infraredemitter and the infrared receiver are in wireless connection through infrared rays which have strong adsorption capacity on sulfur hexafluoride gas; the central processing unit sends a timing detection signal to the infrared emitter; the infrared driver is used for driving the infrared emitter; the infrared emitter emits driven infrared rays outwards after receiving the timing detection signal; the infrared receiver receives the returned infrared rays; wherein the return infrared ray is generated after the sulfur hexafluoride gas is adsorbed by the infrared ray, the infrared comparator compares the return infrared ra