The invention discloses a stand-by power line with a low-resistance plug connection interface on an end part of a wire. The power line comprises a tube shell, an insulating material tube and a wire, and is characterized by also comprising a power receiving module assembly, wherein the power receiving module assembly comprises one arc-shaped chassis, a plurality of conductive column plates and a sliding power receiving block; the arc-shape chassis is in rolling connection with the tube shell through an electric wheel set; the conductive column plates are connected with a quick assembly electric plug connection interface and extend into the tube shell; the tube shell, the insulating material tube and the wire comprise low resistors along the axial line and the low-resistance plug connection type connection interface comprises a mortise slot and/or an insertion tenon in sliding fit; the insertion tenon can be inserted into the mortise slot to realize serial connection with the wire and remain a linear expansion telescopic space for absorbing linear expansion of the tube shell, the insulating material tube and the wire so as to guarantee that the shell, the insulating material tube and the wire can still work reliably after repeatedly undergoing thermal expansion and cold shrinkage caused by violent temperature change over 80 DEG C due to exposure to sun radiation and large current of the wire.