The utility model relates to an adopt AD's automation to test electricity and phase -checking device, its technical characterstic lies in: including shell and inside control circuit, control circuit leaves module, CPU module, bias circuit module, step -down circuit module, voltage transformer module, low -pass filtering module and switching power supply module including instructing lamp module piece, ethernet module. The utility model discloses installing the department at interconnection switch, can realizing the electrified function that shows, three -phase alternating current phase sequence phase relationship that also can real -time detection contact point both sides has the remote communication ability simultaneously, can export the testing result to distribution network automation main website system, ensures to close the circling point phase coincidence to reduce the possibility of closing the ring failure.