The utility model relates to the technical field of an electric power system and particularly relates to an outer-wedge-type assembled branching line which is a branching line formed by an outer-wedge-type assembled wire clamp and a steel-core aluminum twisted wire. The outer-wedge-type assembled branching line is formed through connection of two parts: a clenched original wire part and a connection new branching line part. The clenched original wire part is a tailor-made wire clamp which includes a sleeve and a wedge body. The connection new branching line part adopts a hydraulic compression pipe to connect the branching line. The outer-wedge-type assembled branching line has outstanding features of being convenient to assemble and disassemble, safe and reliable, reasonable and simple in structure, high in practicality, convenient to process and install and advanced in technology. The branching line is enabled to achieve a maintenance-free objective while meeting specified mechanical strength and electrical strength demands so that optimal gripping strength and contact area are achieved. Through type tests of tensile force, vibration and temperature rise, face contact uniformity is ensured. Therefore, problems of a node overheating phenomenon and corona discharge are solved and thus personal security of work personnel is ensured effectively and practical demands of production are also met at the same time.