Sealing device for overhead ground wire online electrochemical testing and testing method thereof

The invention discloses a sealing device for overhead ground wire online electrochemical testing. The device comprises a hollow groove body and a groove body which can be vertically combined oppositely, an elastic sealing piece arranged in a through hole and used for being matched with an overhead ground wire to be tested, and a clamping mechanism for clamping opposite combination of the hollow groove body and the groove body, wherein the through hole for being matched with the overhead ground wire to be tested is formed between the hollow groove body and the groove body. According to the scheme, due to the through hole between the hollow groove body and the groove body, through type installation of the overhead ground wire to be tested is achieved to achieve the purpose of online testingof the overhead ground wire to be tested. By arranging the elastic sealing piece, a testing cavity between the hollow groove body and the groove body is isolated from the outside world. Due to the clamping effect of the clamp