Magnetic-levitation train ground device and ground traction power supply system and method thereof

The invention discloses a maglev train ground device and a ground traction power supply system and method thereof, and is applied to the technical field of rail transit. A traction control system; the first traction device is arranged in the main line area and used for receiving the alternating current provided by the traction control system, converting the alternating current, performing traction on the maglev train and enabling the maglev train to obtain power supply through induction of a power generation coil; the current transforming devices are arranged in the main line area and the maintenance area and are used for performing current transforming control in a first mode when receiving a first instruction sent by the operation control system so as to output alternating current to a stator winding, so that the maglev train is powered; and when a second instruction sent by the operation control system is received, variable current control in a second mode is carried out, so that alternating current is out