The utility model relates to a power transmission tower with three-phase lead wires in delta-shaped cross-arm-sharing distribution, relating to the technical field of high-voltage power transmission lines. The power transmission tower comprises a tower body, a lead wire cross arm, an upper insulator string and lower insulator strings, wherein the tower body is provided with the lead wire cross arm, the upper plane of the lead wire cross arm is provided with the upper insulator string, the lower plane of the lead wire cross arm is provided with two insulator strings, and the three insulator strings form a delta shape. According to the utility model, the problem that two layers of lead wire cross arms are needed in the conventional lead wire triangular configuration tower to meet the electric clearance requirement of three-phase lead wires is solved; and while the one layer of lead wire cross arm is omitted, the structural height of the tower is reduced and the manufacture cost is saved.