The utility model discloses a cable plugging device, including the elastomer, set up at the holding down plate of elastomer lower part and set up the top board on elastomer upper portion, elastomer, holding down plate and top board are the ring form that two semicircles parts are constituteed, a plurality of through -hole has all been seted up respectively in its corresponding position to every semicircle part of holding down plate, elastomer and top board, the bolt passes the through -hole and is in the same place holding down plate, elastomer and upper pressing board connection together with the nut, is connected through the forked tail structure between two semicircles of elastomer are partial, elastomer inside sets up the extension elastomer that a plurality of diameter reduces in proper order, and the extension elastomer is the ring form that two semicircles parts are constituteed, just the division line mutually perpendicular of two semicircles parts of two adjacent extension elastomers. The utility model discloses not only has improved the suitability of this device, has reduced the preparation mould kind of elastomer and clamp plate moreover, be convenient for realize standardized, reduced manufacturing cost.