The utility model discloses a discharging gap device. The discharging gap device is arranged on a ground wire insulator chain. The discharging gap device comprises a first fastening piece, a second fastening piece, a first fixed plate, a second fixed plate, an upper electrode and a lower electrode. The head end of the first fixed plate is fixed to a high-voltage end of the ground wire insulator chain through the first fastening piece. The tail end of the first fixed plate is connected with the head end of the upper electrode. The tail end of the upper electrode is an arcing end. The head end of the second fixed plate is fixed to a low-voltage end of the ground wire insulator chain through the second fastening piece. The tail end of the second fixed plate is connected with the head end of the lower electrode. The tail end of the lower electrode is an arc striking end. A gap exists between the arcing end and the arc striking end. The discharging gap device has the advantages that the gap of the ground wire insulator is adjustable, the adjustment is available if the gap fails to meet the ice melting or lightening protection requirements of a ground wire in practical engineering, and the operation is convenient.