The present invention provides an assembly system of a power source line. Since the structure of an existing shearing machine is too simple, manual peeling, riveting and blanking are required, and production speed is slow, while, with the assembly system of the invention adopted, the above problems can be solved. The assembly system of the power source line comprises a rack; two ends of the rack are horizontally provided with a driving shaft and a driven shaft; the driving shaft is connected with a power mechanism which can drive the driving shaft to rotate; a driving wheel is fixed on the driving shaft; a driven wheel is fixed on the driven shaft; a conveyor belt is arranged between the driving wheel and the driven wheel; a plurality of conveying plates are fixed on the conveyor belt; the conveying plates are provided with positioning structures which can locate electric wires; and the rack is provided with a wire feeding device, an outer sheath stripping device One, a detection device One, a wire branching device, a shaping device, an inner sheath stripping device One, a riveting device, an outer sheath stripping device Two, a detection device Two, a flattening device, a wire tensioning and flatly cutting device, an inner sheath stripping device Two, a wire twisting device, a soldering flux dipping device and a tin dipping device. The assembly system is advantageous in high production efficiency.