The invention discloses a high voltage DC control protection system board card testing device comprising a man-machine interface, a control unit, an analog quantity generator, a switching value generator, a communication module and a physics interface module; the control unit and the physics interface module are kept in a CAN bus, TDM bus and Ethernet connection through the communication module, wherein the CAN bus transmits the switching value information, the TDM bus transmits the analog quantity information, and the Ethernet transmits the board card information; the control unit obtains theboard card information accessing the physics interface module through the communication module, starts a corresponding testing flow according to the board card information, and uses the analog quantity generator and the switching value generator to send a test signal to the physics interface module according to the testing flow; the control unit uses the communication module to obtain the test result of the to-be-tested board card, and displays the test result on the man-machine interface. The testing device can test a plurality of board cards of the same or different types in one time, and the detection steps are simple and direct, thus effectively finishing the test works of the high voltage DC control protection system board card.