Compact lightning arrester

The utility model relates to the technical field of lightning arresters, in particular to a compact lightning arrester which comprises an insulating shell, a through hole is formed in the upper end of the insulating shell in a penetrating mode, second threaded grooves are formed in the upper section and the lower section of the inner wall of the circumference of the through hole formed in the second threaded grooves, and installation columns are installed in two rotating grooves formed in the insulating shell in a threaded mode. And first threaded grooves are formed in the separated ends of the two mounting columns correspondingly, and rectangular plates are arranged at the separated ends of the two mounting columns correspondingly. According to the utility model, the metal piezoresistor is arranged between the two mounting columns, so that the metal piezoresistor is much smaller than a common lightning arrester in size, is more compact, is more suitable for being mounted in some smaller places such as a dist