Fault positioning system for submarine cable

The utility model provides a fault positioning system for a submarine cable. The fault positioning system comprises an underwater vehicle, a cover body and an acoustic magnetic measuring probe, the cover body is connected with the underwater vehicle, and the cover body is of a closed structure with a hollow interior; the acoustic magnetic measurement probe is arranged in the cover body, and the acoustic magnetic measurement probe is connected with the underwater vehicle; according to the fault positioning system used for the submarine cable provided by the utility model, acoustic magnetic signals not only can be propagated in the air, but also can be propagated in water, so that a fault accurate positioning instrument based on acoustic magnetic detection and used for a land cable is integrated on an underwater vehicle through modification, and data communication is carried out through arrangement of related interfaces; therefore, the submarine cable fault can be accurately positioned. The fault positioning sy