An intelligent transformer substation relay protection state monitoring and fault diagnosing system body comprises a cabinet. The intelligent transformer substation relay protection state monitoring and fault diagnosing system body is mounted in the cabinet. The inside bottom of the cabinet is provided with a compaction-degree-adjustable conductive device. The compaction-degree-adjustable conductive device comprises a base. The upper part of the base is provided with a telescopic rod. The upper part of the telescopic rod is hinged with a rotating plate. The middle part of the rotating plate matches the telescopic rod. According to the intelligent transformer substation relay protection state monitoring and fault diagnosing system body, the compaction-degree-adjustable conductive device is arranged at the lower part of the cabinet; the compaction-degree-adjustable conductive device can adjust a rotating conductive plate by a certain angle when connection with a power supply by the intelligent transformer substation relay protection state monitoring and fault diagnosing system is required on the condition that a rotating conductive plate matches an accessing conductive plate, so that the rotating conductive plate and the accessing conductive plate are in a parallel state, thereby realizing tight abutting and preventing point contact or linear contact between the rotating conductive plate and the accessing conductive plate.