The external steel shell concrete special-shaped cable tower structure of cable-stayed bridges is subjected to complex forces, and there are problems such as deformation and excessive stress during the construction stage. To ensure the construction safety and linear standards of this type of cable tower, three support schemes were designed to reduce the stress and deformation of the cable tower, and the technical performance of different support schemes was analyzed using the finite element method. The analysis results show that the arch axis of the irregular cable tower has a significant impact on the stress and deformation of the tower column, and the stress and deformation of the cable tower calculated by different modeling methods vary greatly. The support of all three schemes can significantly reduce the deformation of the cable tower and the tensile stress of the concrete inside the cavity, while the four channel double pipe scheme is the most effective in reducing construction difficulty and errors. The deformation of tower columns and the tensile stress of concrete are sensitive to wind pressure, and the design of wind resistance measures for tower columns should be strengthened during construction.