The utility model discloses a multipurpose optical-fiber composite-structure cable, which comprises a cable core, wherein the cable core comprises an insulating wire core (1), a first buffer layer (2), a second buffer layer (5) and a metal sleeve (6) in sequence from inside to outside, a metal wire (3) and optical cable units (4) are arranged between the first buffer layer (2) and the second buffer layer (5), and the optical units (4) and the metal wire (3) are wound on the first buffer layer (2) together. The multipurpose optical-fiber composite-structure cable disclosed by the utility model is suitable for power cables and submarine cables and simultaneously has multiple purposes such as communication transmission, temperature-measuring monitoring and early-warning monitoring; the metal wire (3) is wound between the buffer layers to enhance the electric connection between the buffer layers and the metal sleeve (6), and meanwhile, the short-circuit capacity is further improved; a plurality of optical cable units (4) can be placed between the buffer layers, the number of the core of each optical cable can exceed one hundred so as to fully meet requirements on large-capacity communication model transmission; and the multipurpose optical-fiber composite-structure cable is more accurate for temperature-measuring monitoring, the optical cable units are placed in the metal sleeve, the processing risks are low, the corrosion from sunlight, seawater, moisture and smoke is avoided, and thus, better safety and reliability are achieved.