The invention discloses a device and a method of leading multiple split conductor devices in a power transmission line span. The device comprises connecting plates, a parallel hanging plate, a lengthening pull rod, strain clamps, a grading ring, a spacer and connecting hardware, wherein the connecting plates are divided to a leading-side connecting plate and a force bearing-side connecting plate;the two connecting plats are connected and fixed respectively at two sides through the parallel hanging plate and two groups of bolts; the strain clamps are equally divided into two groups, one groupis connected to the leading side, and the other group is connected to the force bearing side, and the strain clamps are fixedly connected with the lengthening pull rod or the connecting plates throughthe connecting hardware. According to the device and the method of leading multiple split conductor devices in the power transmission line span, an electrified conductor on one side is led out, the conductor on the other side is not electrified, only the force bearing effect is achieved, the device and the method can be used for leading the conductor in the span when the line is cut off and can also be used for leading the conductor between sub-towers to a main tower during single-loop transposition, simplicity and convenience are achieved, and engineering cost is reduced.