Taking the project of Shizimen Channel crossing part of 220 kV Qinyun (Zhuhai)-Lianhua (Macao) Power Transmission line (Lot-3) as an example, the construction technique for long distance river-crossing cable with extra cross-sectional size cable laying inside pipeline was introduced. Firstly, horizontal directional drilling machine was used to cross the river channel, then protective pipeline was laid for cable and high-power hydraulic puller was used as the pulling machine; at the same time cable support with brake equipment was used as the supporting device for transmission cable laying. Compared with the conventional construction method that only uses manual maneuvering winch as single power, the construction method that uses high-power hydraulic puller in cable laying is more safe, economic, and effective.