Icing of transmission lines will have a negative impact on the safety of line operation and human production and life. The research on anti-icing has gradually developed from the early active anti-icing to the present passive anti-icing, but the passive anti-icing research mostly stays on the improvement of hydrophobicity without in-depth exploration of its anti-icing principle. For common droplet transmission cables, the corresponding calculation model is built. The relationship between the contact time, spreading radius and contact angle between droplet and cable is discussed by using the built-in VOF of Fluent to calculate different hydrophobic surfaces, and the pressure nephogram and velocity vector diagram of droplet under different contact angles are analyzed. The simulation results show that the motion state of the droplet contact with the wall is affected by the wall contact angle, and the spread area and contact time of the droplet are inversely proportional to the wall contact angle. Increasing the wall contact angle will reduce the spread area, reduce the contact time, accelerate the droplet retraction and rebound, and the moving droplet will eventually slide off the wall. The spread area of the wall surface with small contact angle increases and the contact time increases. The droplet finally spreads completely and stays on the wall surface. These results have certain guidance and reference significance for exploring the principle and characteristics of droplet icing on cable wall under different hydrophobicity.