A power supply method for a rail-mounted mobile device

The invention discloses a power supply method for a rail-mounted mobile device. The method comprises the following steps: self-inspection of the mobile device; transmitting a charging instruction; receiving the charging instruction; preparing charging docking; sending a control instruction; sending a docking instruction. A two-stage charging mode of a three-stage structure is adopted. A power supply system, an energy transfer system, the mobile device, i.e., a tunnel early warning patrol robot can make cooperative operation to implement mobile charging, the required electric quantity of the patrol robot and the inspection efficiency are ensured; meanwhile, 24-hour all-weather work can be ensured, the tunnel traffic safety and the road supervision efficiency are effectively improved, the labor cost of road supervision is reduced, the personal safety of road supervisors is also ensured, the traffic patrol safety is improved, and the method is recommended to be widely popularized and applied in the traffic law e