Abstract: Compared with conventional mechanically refrigerated trucks, LNG refrigerated vehicles combine the benefits of clean energy adoption and enhanced energy efficiency, significantly reducing compressor energy consumption and environmental impact. This study constructs a cold energy recovery system for LNG refrigerated trucks to analyze operational energy consumption. The effects of pump and fan flow rates on the total system energy usage are investigated, and the characteristics of cold energy release during LNG vaporization from storage tanks to the engine are quantified. The results indicate that optimizing the fan flow rate to 929 kg/h and increasing the pump flow rate to 161.3 kg/h reduces total system energy consumption to a minimum of 0.1008 kW. During the LNG phase change, a total of 3.565 kW of cold energy is released, of which only 1.4 kW is utilized by the coolant system, leaving 2.165 kW available for further applications. This research provides a theoretical foundation for energy-saving optimization in cold chain logistics and the cascaded utilization of LNG cold energy.