The invention provides a cold energy utilization system. The cold energy utilization system comprises an LNG modulation and refrigeration unit, an LNG transport unit and a cold energy utilization unit. LNG is modulated by the LNG modulation and refrigeration unit, then cooled to be lower than the superconducting critical temperature, and then transported to the cold energy utilization unit throughthe LNG transport unit. The cold energy utilization unit comprises a first cryogenic pump, a condenser, a second cryogenic pump, an evaporator, a turbo expander and a generator. The LNG enters the condenser from the first cryogenic pump and then fully exchanges heat with refrigerant vapor, the LNG becomes gas NG and flows out from the condenser, the gas NG is condensed into a low-pressure liquidrefrigerant through the refrigerant vapor and then enters the second cryogenic pump, the cryogenic pumps pressurize the low-pressure liquid refrigerant to a high-pressure liquid refrigerant, the high-pressure liquid refrigerant enters the evaporator for heat exchange and then is evaporated into high-pressure gas, the high-pressure gas enters the turbo expander to be expanded into low-pressure gas,the generator is pushed to generate electric power, and therefore the cold energy is effectively utilized.