The invention discloses a lightning arrester device and a regulating method for detecting the automatic balance of direct current supply of transformer substations. The lightning arrester device comprises a hollow barrel. The hollow barrel is arranged at the upper end of an insulating telescopic rod and is perpendicular to the insulating telescopic rod, an annular magnet is arranged on a side of the barrel, the size of the annular magnet is matched with the diameter of a hole of the barrel, a motor is arranged in the barrel via a slide mechanism, a turntable sleeves an end of a rotary shaft of the motor, a conductive brush is arranged on the outer side of the turntable, a turntable tightness compression regulating mechanism is arranged in the barrel, and an elastic conductive sheet which is connected with the rotary shaft of the motor is arranged in the barrel. The lightning arrester device and the regulating method have the advantages that wires can be shifted onto metal components of a lightning arrester only by a single person in a time-saving and labor-saving manner and are in excellent contact with the metal components, the person does not need to climb to clean corrosion substances of the metal components, accordingly, the labor intensity is extremely low, more importantly, an integral wiring procedure can be completed by the single person in one minute, and the wiring efficiency is extremely high.