The utility model discloses a multipurpose intelligence mimic -disconnecting switch sets up to be used for relay protection testing behind electric power system's overload protection device, includinglogic modules and executable module, the last optical fiber interface that suits with protection device that is equipped with of logic modules, the digital analog conversion component that is connected with the optical fiber interface, the CPU data processing element who is connected with the digital analog conversion component, what be connected with CPU data processing element leaves the component, opens the component, and opens the component and is connected the LED lamp, the executable module includes and leaves component connection's starting element, with the execute component who starts component connection, with the state component of carrying out component connection, the state component still be connected to out to go into on the component, leave and be connected with the interface on the component. The utility model discloses can use in examining work surely at the newly -built engineering of intelligent substation, intelligent substation with on being connected to intelligent substation, can be connected to conventional transformer substation again on, be applied to the protection debugging work of conventional transformer substation.