I. The vehicle-mounted methane power-off device for mines is based on technologies such as methane concentration detection, over-limit and fault locking, and wireless transmission. With equipment such as methane sensors, power-off instruments, and wireless transmission devices, it can realize real-time detection of methane concentration in the operating environment of underground mobile mechanical equipment such as coal mining machines and roadheaders, automatic power-off when the concentration exceeds the limit, automatic locking when the device fails, etc., eliminating potential safety hazards and risks. Furthermore, it can also automatically notify the methane concentration information and power-off alarm information around the underground mobile equipment to achieve 24-hour remote monitoring, providing technical support for ensuring safe production of mines. II. In view of the notice on promoting the installation of "electronic fence" in dangerous working areas of coal mines across the whole province, the above systems are effective to prevent frequent injury accidents of large machinery such as underground crusher, loader, roadheader, crusher and belt conveyor roller. The utilization of diversified technical means can achieve personnel proximity alarm and equipment shutdown, ensuring life safety.