The invention belongs to a sodion concentration table and particularly relates to a sodion concentration table output current simulation device. The device includes a CPU controller, a programmable current generator, a first relay and a second relay, wherein a control end of the CPU controller is connected with control ends of the first relay and the second relay, a normally-opened point of the first relay is connected with a current signal negative end of the programmable current generator, a normally-opened point of the second relay is connected with a current signal positive end of the programmable current generator, a common end of the first relay is connected with an input negative end of an electromagnetic isolation module, and a common end of the second relay is connected with an input positive end of the electromagnetic isolation module. The device is advantaged in that a problem that the sodium ion concentration meter must perform indicating value simulation or logic change release of an interlocking signal from an engineering station when performing preventive and corrective maintenance work is solved, reliability and timeliness of temporary changing works are guaranteed,human errors are reduced, and operation safety of the unit is improved.