The utility model provides a generating line bridge construction is pressed to main step -down, main step -down presses the generating line bridge once to connect the generating line between once connecting, its characterized in that to the low tension side wall bushing from low voltage side of main transformer the generating line includes copper tub of generating line and copper row of generating line, wherein copper tub of generating line passes through generating line link fitting and links to each other with generating line link fitting bracket to on being fixed in generating line support vase, copper tub of generating line facial make -up is equipped with arrester connection copper bar simultaneously, and continuous through its and arrester, copper row of generating line one end links to each other with copper tub of generating line, and the other end once connects with low voltage side of main transformer or the low tension side wall bushing once connects continuously to it is fixed through the fixed vase of generating line, main step -down press the generating line bridge to hang the department of establishing keeps the thermal shrinkable sleeve except that the earth connection, other positions scribble thickness at least for 0.3mm's insulating coating material, wherein to behind can the dismantlement department spraying conventional surface conditioning agent of bolt, the helmet of dismantlement when adding the lid and being used for next maintenance, it has characteristics such as insulation level height, simple structure.