A tension-resistance double-string-insulator cross arm side connection hardware fitting electrified replacement clamp comprises a front clamp body and a rear clamp body, wherein the two sides of the front clamp body are connected with the two sides of the rear clamp body through lead screws; each lead screw comprises a casing tube, threads are arranged on the inner walls of the casing tubes, two ends of the casing tubes are connected with screw rods respectively, and threads of the screw rods correspond to the threads of the inner wall of the casing tube; the outer walls of the casing tubes are sleeved with action rods perpendicular to the casing tubes, and when the action rods rotate forwards, the lead screws shrink; when the action rods rotate backwards, the lead screws extend; the front clamp body is provided with calipers in bilateral symmetry, one ends of the calipers are connected with the front clamp body through rotating shafts, and the other ends of the calipers are locked with the front clamp body through bolts; when the calipers are locked, first through holes are formed between the calipers and the front clamp body, and the shape of the first through holes corresponds to that of steel caps of insulators; the middle of the rear clamp body is provided with a connecting piece locked with the rear clamp body through a bolt, a second through hole is formed between the connecting piece and the rear clamp body when the connecting piece is locked, and the shape of the connecting piece corresponds to that of an extension ring of a connection hardware fitting.