The invention discloses a cat-head type tower for a one-way overhead line cable T joint. The cat-head type tower comprises a tower body, ground wire cross arms, middle-phase wire cross arms, side-phase wire cross arms, upper-layer cable auxiliary cross arms and lower-layer cable auxiliary cross arms; the two layers of ground wire cross arms are located on the uppermost portion of the tower body, arranged to be perpendicular to the line direction and used for hanging ground wires; the middle-phase wire cross arms are located under the ground wire cross arms, V-shaped suspension strings are fixed to the inner upper portions of the middle-phase wire cross arms and used for hanging middle-phase wires, and double-I-type downward cable leading terminals are arranged under wire hanging points arranged in the middle-phase wire cross arms. The cat-head type tower for the one-way overhead line cable T joint has the advantages that the cable T joint is achieved by adopting one base tower, the building cost is low, small area is occupied, little influences on stress of adjacent poles and towers are generated, an original line arrangement mode is not changed, adjacent tower transformation is generally not needed, and the cat-head type tower is suitable for building adjacent linear towers and tension-resistant towers.