Railway vehicle ground power supply interlocking device and railway vehicle ground power supply access method

The invention provides a railway vehicle ground power supply interlocking device and a railway vehicle ground power supply access method. The device comprises a ground power supply module, a vehicle-mounted power supply module, a first interlocking control module, a second interlocking control module and a third interlocking control module, wherein the ground power supply module is used for supplying electric energy of a ground power supply to the vehicle-mounted power supply module; the vehicle-mounted power supply module is used for supplying the electric energy provided by the ground power supply module to a load in a railway vehicle and controlling the connection or disconnection of a power supply bus in the railway vehicle; the first interlocking control module is used for controlling the state of a pantograph of the railway vehicle and the state of a main circuit breaker of the railway vehicle; the second interlocking control module is used for controlling the on-off state of a contactor according to th