The invention discloses a 110-220KV overhead line connection change system. The 110-220KV overhead line connection change system comprises a single loop connection change terminal pole tower (4), a single loop corner pole tower (5), a two phase transverse short connection guide wire (6), a single loop three phase vertical short connection guide wire (7) and a single loop three phase guide wire (8) which transversely pass through a loop (2), wherein an upper phase guide wire (10), a middle phase guide wire (11) and a lower phase guide wire (12) on the side of a loop (1) of double circuit lines on the same pole tower are changed to connect the external side of a loop (2) of the double circuit lines on the same pole tower, and then connected with the single loop corner pole tower (5), the loop (2) of the double circuit lines on the same pole tower is not cut off, and additionally, and united lightning protection are achieved on both a ground wire (9) on the loop (1) of the double circuit lines on the same pole tower and two ground needles (17) on the single loop connection change terminal pole tower (4) and both another ground wire (9) on the loop (2) of the double circuit lines on the same pole tower and another two ground needles (17) on the single loop corner pole tower (5). The 110-220KV overhead line connection change system is technically feasible and low in connection change cost, occupies small cultivated land, and reduces influences on grid load tide distribution due to the fact that a person does not need to cut off the single loop on the side of the double circuit lines on the same pole tower, which does not need connection change.