The gas alarm controller and gas detector can be used to detect toxic and harmful gases and flammable and explosive gases in the air, and the gas controller and gas detector are used in the mode of single to multiple connection. The controller can detect multiple gas detectors in a centralized manner with high response speed. When the gas concentration of the gas alarm in the environment reaches or exceeds the preset alarm value, the controller can issue an audible and visual alarm in time to remind you to take safety measures in time, and control the drive exhaust or other peripheral actions to prevent the occurrence of poisoning, fire and explosion accidents, so as to protect the safety of life and property.