The invention discloses a protective body of a grounding conductor, which forms powder material by mixing cement and graphite based on certain proportion; the powder material is added with water and stirred, and then is filled around a guarded electrode to form a solid protective layer. The protective body is applied to the earthing of transformer stations, power plants and A-D electric transmission systems, so as to prolong the service life of Geobean grounding conductors as well as greatly save the Geobean construction funds and the maintaining and replacement costs when in running.