Abstract: The paper introduced system composition and design of hardware circuit and software of an on-vehicle power-off control device for methane based on technologies of infrared detection and wireless communication.The device can realize on-line monitoring and control of gas concentration nearby coal plough,send gas concentration signals and power-off signals to substation by wireless communication and eventually transfer the data to existing monitoring and control system of coal mine,which solves problems of on-line monitoring and control and data transmission of gas nearby coal plough in working face of coal mine.