Optical fiber composite phase line optical cable (OPPC) combines optical fiber units with phase line conductors, and has the functions of power transmission, lightning protection and optical communication. Single-mode optical fibers are encapsulated in high-strength protective tubes, filled with special protective materials, and twisted with high-conductivity phase line conductors to form dual-function cable bodies. It is used for high-voltage transmission lines of 110kV and above, and can replace traditional phase lines to achieve synchronous transmission of electrical energy and optical signals. It is also suitable for the renovation of old lines. It can simultaneously conduct short-circuit current and protect against lightning. Moreover, its structure can be customized as needed to adapt to different engineering scenarios.