Power supply device of mobile flash rail welding machine

The invention relates to a power supply device, in particular to a power supply device of a mobile flash rail welding machine, and solves the defects and problems of an existing movable flash rail welding machine by adopting a diesel generator set as a power supply device. The power supply device comprises a storage battery pack, a super capacitor bank, a bidirectional DC/DC converter and a welding main inverter, the super capacitor bank is connected with one end of the bidirectional DC/DC converter, the other end of the bidirectional DC/DC converter is connected with the input end of the welding main inverter, the output end of the storage battery bank is connected with the input end of the welding main inverter through an isolation switch KM2, and the output end of the welding main inverter supplies power to the movable flash rail welding machine. The device avoids the oil fume pollution and is particularly suitable for welding underground rails, such as subways, etc., enables the economic benefits of users