A seabed photoelectric composite cable is formed by a conductor (2), a conductor shielding layer (5), an insulating layer (6), an insulating layer shielding layer (7), a water blocking buffer layer (8), a metal sleeve (1), an inner sheath (9), a lining layer (10), a protective filling layer (11), an inner armour cushion layer (12), an armour layer (13) and an outer armour protection layer (14) which are arranged in sequence from the inside to the outside. The seabed photoelectric composite cable is characterized in that a cable core of the cable is formed by the conductor (2) and an optical fiber (3). Compared with the prior art, the seabed photoelectric composite cable has the advantages that the optical fiber, metal protection tubes of the optical fiber and the conductor are twisted into the cable core, an optical fiber temperature measuring device is utilized to measure the temperature of the conductor, the test data or the repeated test is not interfered by process or manual operation, and the good conductor temperature measuring precision and the real current carrying capacity of a submarine cable can be obtained.