Clamping device of earth connection

The utility model relates to a join in marriage net maintenance instrument technical field, more specifically relates to a clamping device of earth connection, including the chuck, advancing post, clamping piece, pole portion, the chuck includes lug, lower lug and connecting block, goes up lug and lower lug parallel arrangement and fixes respectively the both ends of connecting block form takes the notched structure, impel the post to pass down lug and lower lug threaded connection, advance the post to get into the fixed clamping piece of the inside one end of recess, clamping piece and connecting block sliding connection, the one end that the connecting block was kept away from to last lug is provided with the arch towards the orientation of recess, protruding and last lug is fixed or bea whole with last lug, impel the post to include the fixture block in the outside one end of chuck, the fixture block is the polygon, pole portion include one with fixture block complex polygonal groove or polygonal through h