A grid-connected power supply control system for an urban rail vehicle, and an urban rail vehicle. The control system comprises a first relay (11) and a medium voltage bus bar contactor (12). The first relay (11) is connected to the medium voltage bus bar contactor (12) and a processor (13), and is used for receiving a first control instruction sent by the processor (13), and controls on or off of the medium voltage bus bar contactor (12) according to the first control instruction. In the grid-connected power supply control system, the on or off of the medium voltage bus bar contactor (12) is controlled not by a high or low level output by a network system, but by the first relay (11) according to the received first control instruction. Therefore, even if a failure occurs to an input/output module of the network system, a train power supply system keeps maintaining in a grid-connected power supply mode before the first relay (11) receives an instruction of controlling off, thereby significantly improving the utilization rate of the grid-connected power supply mode.
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