Lightning protection device

The invention discloses a lightning protection device, which comprises an insulator and a lightning arrester body, wherein the insulator is used for supporting an overhead line; the lightning arrester body is arranged on the insulator; and after a voltage of the overhead line is higher than a threshold, an air gap is broken down, the lightning arrester body is conducted and overvoltage energy is released. The lightning arrester body comprises a base and an insulating pipe; the base sleeves the lower end of the insulator; one end of the insulating pipe is connected with the base; a plurality of chamber electrodes and a plurality of arc extinguishing chambers are sequentially arranged in the insulating pipe at intervals; and a blowhole is formed in the top end of each arc extinguishing chamber. According to the lightning protection device, an electric arc is blown off by a high-speed gas, so that a discharge arc caused by an overvoltage of the line is effectively cut off; the reliability and the safety of a pow