Abstract: In order to improve the lightning resistance of high-voltage overhead line and solve the problem of lightning protection in power grid, a lightning protection device for arc extinguishing of explosion airflow using high-speed airflow is developed based on "dredging type" lightning protection technology. The device allows the air gap to break down to form an arc channel, and simultaneously adopts the lightning pulse signal to trigger the arc extinguishing gas pill synchronously in the moment of arc formation, in order to produce the high speed air flow to completely extinguish it in the early stage of the arc construction of the power frequency arc, and the strong air flow can quickly restore the strength of the air medium and prevent the arc from re-burning. Firstly, the principle of arc extinguishing of the device is discussed in detail, and then, the response is triggered by lightning shock test and test device trigger response time test and power frequency high current arc extinguishing test to test the electrical performance and arc extinguishing effect of the device. The test results show that it meets all the test requirements. Finally, according to the actual operation effect, it is found that the device in the line operation conditions are good, and the lightning protection effect is excellent.