The invention discloses a grounding body connecting piece with adjustable height. The grounding body connecting piece comprises a U-shaped shell, a movable U-shaped table extrusion part, a dovetail type fixed plate and a bolt. When the grounding body connecting piece is in use, a to-be-connected graphite grounding body is placed into the bottom of the U-shaped shell; the movable U-shaped table extrusion part is transversely pushed into the U-shaped shell (the protruding part on the movable U-shaped table extrusion part is matched with a dovetail groove in the U-shaped shell in pushing) from one side of the U-shaped shell to a longitudinal sliding rail; then, the movable U-shaped table extrusion part moves downwardly along the longitudinal sliding rail to tightly press the graphite grounding body; next, the dovetail type fixed plate is pushed into the U-shaped shell from one side along the dovetail groove in the U-shaped shell; and finally, the bolt which passes through the fixed plateis tightly screwed downwardly to fix the U-shaped table extrusion part. By adjusting the screw, the connection height can be realized, namely, adjustment of the number of the graphite grounding bodies; and the grounding body connecting piece has the characteristics of simple structure, corrosion resistance, relatively low cost and the like, and has the advantages of convenience in use, reliable connection, low contact resistance and the like.