The utility model discloses a lightning arrester, including lightning -arrest pipe I, take shelter from the thunder pipe II, lightning -arrest pipe III and fixing base, the fixing base is native font, comprises an upper fixed plate, bottom plate and support frame, the support frame upper end is equipped with locking device, fixes the middle part at lightning -arrest pipe II through locking device, the internal diameter of lightning -arrest pipe I, lightning -arrest pipe II, lightning -arrest pipe III is the same, and loops through locking device and fix into a coaxial body structure, and is 60 tilt up with the bottom plate, lightning -arrest pipe III is located topmost, and the top is equipped with the lightning rod, every locking device all includes two snap rings, every snap ring all includes both ends locking board and middle clamp ring, the clamp ring semicircular in shape, be equipped with corresponding locking hole on the locking board respectively, two snap rings fasten through the both ends downthehole bolt of locking. The utility model discloses lightning arrester simple structure, simple to operate is nimble, and the security performance is high, can effectively protect transmission line, reduces lightning flashover rate.