The utility model discloses an overhead ground wire coupling mechanism in transformer substation station, hang the point including overhead ground wire top of the tower board, U type link, the extension ring, three diagonal connection boards of improved generation, improved generation strain clamp, overhead ground wire top of the tower board one side is provided with two string points that parallel, every hang the point in proper order with U type link no. 1, the extension ring, U type link no. 2 is connected, three diagonal connection boards of U type link no. 2 and improved generation are connected, U type link and an extension ring and a string point connection that three diagonal connection boards of improved generation disposed through two covers, three diagonal connection boards of improved generation pass through strain clamp bolt and improved generation strain clamp fixed connection. This is novel effectively alleviates rocking of the overhead ground wire link fitting that is aroused by wind -force, avoids the single bolted connection's of appearance between overhead ground wire and the framework the condition, has promoted the stability of overhead ground wire.