The utility model relates to a fault transient traveling wave signal detection sensor. The device comprises a first semi-circular shell and a second semi-circular shell which are sequentially connected end to end, a first semi-annular magnet and a second semi-annular magnet are respectively arranged in the first semi-annular shell and the second semi-annular shell; the first semi-annular shell andthe second semi-annular shell are detachably connected in a clamped mode, and elastic devices are arranged on the inner side walls of the first semi-annular shell and the second semi-annular shell; the fixing device has the advantages of being convenient to disassemble and fix and good in fixing effect.