The invention relates to a sea
electric power cable which comprises a conductor (1), semi-conduction layer (2),
insulation layer (3), a buffer layer (4), a lead casing (5), an inner jacket layer (6), an armor layer (7) and an armored outer protective layer (8) which are arranged from inside to outside. The invention is characterized in that the inner jacket layer (6) is a
mixed layer formed by the end-to-end connection of the semi-conduction layer and the
insulation layer in series. Compared with the prior art, the armored inner jacket layer adopted by the invention is the
mixed layer formed by the end-to-end connection of semi-conduction layer and
insulation layer in series. Such design has the
advantage that the
underwater portion and the onshore portion of the sea
electric power cable comprise different inner jacket
layers, wherein the
underwater portion is an anticorrosive semi-conduction layer, thereby effectively solving the problem of induced potential, and further solving the problem of circular current; and the onshore portion is an insulation layer which is the same structure as the common
electric power cable, thereby realizing cross
interconnection, and further achieving the purposes of reducing loss and raising current capacity.