The embodiment of the invention discloses an analog transformer device. The analog transformer device comprises an oil container containing insulating oil, an oil pump enabling the circulation of the insulating oil, and an oil-water separator used for carrying out separation on the insulating oil. A temperature sensor is arranged on the bottom part of the oil container. An electrode pair for charging the insulating oil is arranged on the center position of the oil container. Heaters for charging the insulating oil are symmetrically arranged around the electrode pair. The analog transformer device provided by the invention can accurately electric faults of transformers for partial discharge and breakdown discharge, and component contents of dissolved gas in the insulating oil and grease mixed insulating oil under the various electric faults are obtained, so that references are provided for judging whether the operation state of the transformer is normal and whether potential faults exist.