The invention relates to a lightning arrester disconnector device, which comprises a wire, a lightning arrester and an electric corrosion wire, wherein one end of the lightning arrester is provided with a first electrode, the other end is provided with a second electrode, the first electrode is adjacent to the wire and spaced from the wire, a main gap is formed between the first electrode and thewire, and the second electrode is away from the wire; and one end of the electric corrosion wire is connected with a ground wire, the other end is connected with the end, which is away from the wire,of the lightning arrester, the electric corrosion wire and the second electrode are arranged at intervals, and an auxiliary gap is formed between the electric corrosion wire and the second electrode.The lightning arrester disconnector device can be applied to a lightning arrester with a series air gap and is used for cutting off a discharge channel after the lightning arrester is broken down, sothat the problem that the lightning arrester with the series air gap is easy to frequently discharge to cause line tripping is well solved. The whole device is not grounded any more, and the dischargechannel is cut off, thereby being no longer a weak point on the line.