The utility model discloses a grounding wire connection device and belongs to the electric power grounding technology field. A technical scheme is characterized in that the grounding wire connection device is mainly formed by a grounding electrode and a grounding wire plug connector which are mutually plugged; one end of the grounding wire plug connector is provided with a seat body connected to a grounding wire and the other end is a cylinder structure which matches with a grounding electrode plug hole; the cylinder is provided with arc grooves along a peripheral direction; an upper portion of the grounding electrode is provided with a compaction mechanism. Fixing and installation of the rounding wire and the grounding wire plug connector are firm, shedding is not easy to generate and contact is reliable. Grounding wire dismounting work is performed conveniently and rapidly. Working efficiency is high. Different models and specifications of leads can be rapidly compacted. Besides, connection of the grounding wire plug and the grounding electrode is realized based on spring pressure. After a test, a grounding resistance is above 2 omegas, which accords with a regulation requirement. The device possesses a popularization and application value.