The utility model discloses a satellite positioning system for a submarine cable, aiming to solve the problem that the submarine cable is difficult to accurately position and salvage in case of a fault due to a great GPS (Global Positioning System) error when the submarine cable is laid. The system is characterized in that: one end of the submarine cable is sealed by a signal closer, while the other end thereof is connected to an inter-joint signal spreader and orderly connected to a GPS signal amplifier and a GPS signal transceiver through a data transmission wire, so that a fault point of the submarine cable becomes the antenna of the GPS signal transceiver; and a remote receiving device receives a first fault signal of the fault point of the submarine cable and is in wireless connection with the GPS signal transceiver through signal exchange. The accuracy of searching and salvaging the submarine cable having a fault is improved and the problem of searching and positioning the submarine cable having the fault during salvage is solved; accurate positioning of the submarine cable having the fault is realized; the construction efficiency of repairing the submarine cable is improved; and the repair cost is effectively reduced.