The work aims to compare the cost benefits of heat pump drying process and traditional fossil energy hot air drying process of mango preserves, so as to provide scientific guidance for the production of enterprises. Based on the drying dynamics model of mango preserves, a life cycle cost and benefit analysis model was established for the drying process of mango preserves. The correctness of the model was verified by the experimental data of mango heat pump drying. The model was used to predict and analyze the heat pump drying plant of mango preserves, and the energy consumption and cost benefits of heat pump drying and traditional hot air drying were compared. The results indicated that under the condition of heat pump drying, mangoes with different heights were heated evenly, and the drying temperature could be precisely controlled. At the same time, compared with coal-fired boiler heating and drying, the heat pump drying could reduce the production cost by 17.1%, which was conducive to reducing the economic burden of enterprises. Compared with those of traditional boiler heating and drying method, the energy consumption of heat pump drying was reduced by 30.17%, and the carbon dioxide emission was reduced by 32%, which was in line with the development strategy of energy saving and emission reduction in China. This proves the superiority of heat pump technology in drying of mango preserves. The model method can also be applied to the production of longan, litchi and other similar agricultural and sideline products, and provide guidance for the production cost control of preserved and dried fruit production enterprises.