An NCSI network card power supply system. A detection module (4) monitors the state of a server; and a control module (5) controls a working state of an isolation module according to the state of the server to control the outputs of a plurality of power supply modules on a mainboard of the server, so as to select one power supply module to supply power to an NCSI network card. Automatic switching to another power supply module can be performed according to different scenarios, so as to realize the same NCSI network card being able to normally work on multiple different PCIE slots; and one card has multiple purposes, such that the research and development time and the cost are saved, and the universality is high.
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