The invention discloses a digital exchange test system, a digital exchange and a computer. The digital exchange comprises a test interface, a master control panel and an OS panel which are sequentially and electrically connected; wherein the OS panel comprises at least one voice circuit interface FXS interface and a voice loop trunk interface FXO interface; the test interface is used for receiving control signals from the outside, the control signals are used for controlling the OS panel to set at least one set state when the FXS/FXO interface enters the digital exchange operation by the master control panel; in addition the control signals are used for controlling the OS panel to detect port information of the FXO/FXS interface at the corresponding set state by the master control panel; wherein the test interface is also used for outputting the port information. The invention can be used for detecting the digital exchange in a rapid and effective manner with high detection quality and low cost.