The invention discloses a quick-connection cylinder type connecting part for a graphite composite grounding body and an application of the quick-connection cylinder type connecting part. The quick-connection cylinder type connecting part comprises an upper semi-circular cylinder body, a lower semi-circular cylinder body, a left annular fixing part and a right annular fixing part, wherein axial cut-through grooves are formed in both of the upper semi-circular cylinder body and the lower semi-circular cylinder body; outer screw threads are arranged on the outer surfaces at the two ends of both of the upper semi-circular cylinder body and the lower semi-circular cylinder body; grooves are formed in the inner edges of the two side edges of both of the upper semi-circular cylinder body and the lower semi-circular cylinder body at equal intervals; inner screw threads are arranged on the inner walls of the left annular fixing part and the right annular fixing part; two clamping grooves are formed in left side of the left annular fixing part in the radial direction; two clamping grooves are also formed in right side of the right annular fixing part in the radial direction; the upper semi-circular cylinder body is placed on the lower semi-circular cylinder body to form an overall cylinder body; and the left annular fixing part and the right annular fixing part are arranged at the two ends of the overall cylinder body in a sleeving manner respectively. The quick-connection cylinder type connecting part is applicable to connection of the graphite composite grounding body; the quick-connection cylinder type connecting part is simple in structure, convenient and rapid to construct, easy to transport and carry, free of welding and other heavy type tools, high in flexibility and low in cost; and meanwhile, the batch production of the quick-connection cylinder type connecting part can be realized, so that the quick-connection cylinder type connecting part is bright in the engineering application prospect.