The invention relates to a device and a method for monitoring and controlling sulfur hexafluoride gas and the derivative gases thereof. The device consists of a main engine and a plurality of transmitters connected with the main engine; the main engine mainly comprises a case, a touch screen display, a main board CPU, a calendar clock device, a voice device, a nonvolatile memory, a main engine power supply, and a driving device respectively connected with a fan and an alarm; the main engine is connected with a host computer which can achieve remote control; and the transmitter mainly comprises a case, an acquisition sensor, a data main board CPU and a high pressure module. The invention designs double channel double detection comparison of concentration monitoring circuits for sulfur hexafluoride gas and the derivative gases thereof; and a compared concentration monitoring circuit is automatically started when the invention has questions on a main concentration monitoring circuit, thereby greatly increasing the reliability of the device; the device can adapt to a plurality of transmitters, has independent monitoring abilities of a plurality of areas, and can achieve linkage control of a plurality of objects such as ventilation fans, cooling fans and the like; the device serves a data recording function and can record and save movements of various alarming and control objects, and the record exists during power cut; the device can be docked with electric transformer monitoring software by adapting to corresponding communication software, so as to achieve the functions of the system of remote communication and telemetry. Meanwhile, the device has the characteristics of light structure, convenient installation and operation and maintenance, and is a novel ideal device formonitoring and controlling the content of sulfur hexafluoride gas and the derivative gases thereof.