The utility model provides an isolator on post, is including touching sword, characterized by: touching the sword both ends and being connected with the flexible coupling of copper line through the fixed fastener of switch respectively, the flexible coupling of copper line is provided with transition terminal connector, and transition terminal connector is connected with the wire, touch on the both ends of sword with the copper line flexible coupling of both sides on be connected through insulator and support base respectively, support base both sides tilt up 40~60. The fixed fastener of the flexible coupling of copper line and switch pass through bolted connection, according to claim 1 an isolator on post, characterized by: the flexible coupling of copper line adopt the stack of the soft copper sheet of 0.1mm multilayer zinc -plating to make. The advantage of this mounting process lies in: reduce the wire swing that expend with heat and contract with cold and wire cause and transmit isolator when wind -force is strong, protection isolator does not receive the influence of circuit both sides atress, guarantees the compaction of isolator contact contact point, reduces that the isolator contact generates heat, the scaling loss rate.