Superconducting cable cooling system

The present invention pertains to a superconducting cable cooling system in which a coolant for cooling the superconducting cable (1) is pumped to a heat-exchanging section (17) by a circulation pump (5), and the superconducting cable is cooled by a refrigerating machine (6). Specifically, the superconducting cable cooling system is characterized by being equipped with a heat-exchanging unit (14) having a cooling space (15) filled with a liquid gas, a flow sensor (8) for detecting the flow rate of the coolant, a temperature sensor (7) for detecting the temperature of the liquid gas filled inside the heat-exchanging unit, and a control unit (50) for controlling the refrigerating machine on the basis of the values detected by the flow sensor and the temperature sensor such that the temperature of the liquid gas filled in the heat-exchanging unit is brought to a prescribed value.