Stand-by power source automatic throw-in device transmission testing instrument

The utility model discloses a stand-by power source automatic throw-in device transmission testing instrument comprising a secondary return circuit voltage input module, a secondary return circuit voltage output module and a control module, wherein the secondary return circuit voltage input module is electrically connected with the secondary return circuit voltage output module through circuit breakers, alternating current contactors and press buttons; the secondary return circuit voltage output module is electrically connected with a stand-by power source automatic throw-in device; the control module is electrically connected with the secondary return circuit voltage input module through the circuit breakers, the alternating current contactors and the press buttons; the control module is used for communication with the stand-by power source automatic throw-in device. The stand-by power source automatic throw-in device transmission testing instrument is simple in structure, and normal power transmission of a