The utility model discloses a ground connection chain adjuster, include: the rim plate, the rim plate is whole to be rotary size, and it has the supporting part that is used for twining the ground connection chain to and be used for the fixed establishment of solid ground chain, the shaft, this shaft is worn to establish the center of rim plate, the rim plate can be relative the shaft rotates, locking mechanism, it includes: through wheel shaft sleeve establishes the rim plate is outer compresses tightly the support, compress tightly on the support along radially keeping away from of rim plate the one end of rim plate is provided with cooperation portion, wear to establish compress tightly the piece in the cooperation portion, the cover is established compress tightly an outer pressure spring, its both ends are supported respectively and are leaned on it is close to to compress tightly the piece the one end of shaft with between the cooperation portion. The utility model provides a ground connection chain adjuster, ground connection chain easily adjust, effectively utilize length and be difficult for losing long service life.