According to the numerical simulation of the multi-temperature heat release process of a finned tube solid-liquid phase change regenerator, the heat release characteristics of the multi-temperature phase change heat transfer process were analyzed. The results show that the temperature change rate of low-temperature phase-change material of the regenerator is higher than that of high-temperature phase-change material. This is because the flow rate of low-temperature refrigerant of the regenerator is higher than that of high-temperature refrigerant, and for low-temperature refrigeration, the temperature difference between the outlet temperature of the agent and phase change material is higher than that for high temperature refrigeration. The enthalpy method was used to numerically simulate the melting and solidification process of the single-tube regenerator model with the first type of boundary conditions. The high- and low-temperature liquid phase ratios and the temperature changes of the regenerator were simulated and analyzed, and compared with the experimentally measured data. A comprehensive analysis on the heat storage and discharge characteristics of the phase change heat transfer process was arride out, which can further improve the high and low temperature energy distribution of the energy storage defrosting process.