Locomotive power supply circuit applicable to multiple power supply modes

The utility model relates to a locomotive power supply circuit applicable to multiple power supply modes, which comprises a traction storage battery power supply module, an in-stock power supply module, a generator unit power supply module, a current collection power supply module and a charger module; the current collection power supply module and the traction storage battery power supply module are respectively and parallelly connected with a contactor K01 and a contactor K02, and then are serially connected with a quick circuit breaker Q01 and are connected into a main circuit; wherein an isolation diode V01 is serially connected between the output end of the traction storage battery power supply module and the contactor K02; one input end of the charger module is parallelly connected and mounted into the main circuit through a contactor K08, and the other input end of the charger module is respectively connected with the in-stock power supply module and the generator unit power supply module through a contactor K03 and a contactor K04; and the output end of the charger module is connected between the traction storage battery power supply module and the isolation diode V01. The locomotive power supply circuit applicable to the multiple power supply modes can realize the mutual matching and the mutual coordination of multiple power supply modes of a metro engineering maintenance vehicle, and is simple and easy to control.