The utility model provides a +/-1100KV DC line strain tower lightning arrester device. The strain tower comprises a strain tower body, a wire cross arm is fixed on the strain tower body, the wire cross arm is connected with a wire through a jumper wire V string, a squirrel-cage hard jumper tube is arranged at the intersection of the wire and the jumper wire V string, and the lightning arrester device at least comprises an overhanging support, a lightning arrester and a drainage wire. The overhanging support is formed by obliquely extending upwards from a strain tower wire cross arm, and the top end of the overhanging support is located over the squirrel-cage hard jumper tube. The low-voltage end of the lightning arrester is suspended on the overhanging support, and the high-voltage end ofthe lightning arrester is connected with the wire and the squirrel-cage hard jumper tube. The lower ends of the drainage wires are connected to the wire, and the upper ends of the drainage wires are connected to the high-voltage end of the arrester. The gapless lightning arrester device provided by the utility model can reduce the operation overvoltage level of a DC line, reduce the gap value, further reduce the size of the tower head of an iron tower, and greatly save the line engineering investment.