The invention provides an electric polarization controller automatic debugging device which comprises a polarization beam splitter, a power supply, a core board, a semiconductor laser module, a debugged electric polarization controller, a high-voltage delay circuit, a first light intensity measurement module and a second light intensity measurement module. The semiconductor laser module is connected to the debugged electric polarization controller, the debugged electric polarization controller is connected to the EPC to be debugged, the EPC to be debugged is connected to the polarization beamsplitter at the same time, the polarization beam splitter is connected with the first light intensity measurement module and the second light intensity measurement module, and the high-voltage delay circuit is connected between the debugged electric polarization controller and the EPC to be debugged. The semiconductor laser module, the high-voltage delay circuit, the first light intensity measurement module and the second light intensity measurement module are connected to the core board, and the power supply is used for supplying power. The invention further provides an electric polarizationcontroller automatic debugging method. The device has the advantages that automatic debugging is achieved, and the defects that manual adjustment has high requirements for operators, time is wasted inoperation and efficiency is low are overcome.