Large-length undersea three-core cable

The utility model relates to a large-length undersea three-core cable. The large-length undersea three-core cable comprises three electricity transmission cables of the same structure, and further comprises at least one fiber-optic cable. The electricity transmission cables and the fiber-optic cable are all wrapped in a cable protecting sleeve. Compared with the prior art, the large-length undersea three-core cable has the advantages of being good in mechanical performance, low in cost, convenient to transport, and the like.