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The invention discloses a high-heat-capacity and low-corrosivity carbonate molten salt heat transfer and storage medium, a method and application, and belongs to the technical field of molten salt heat storage. The high-heat-capacity and low-corrosivity carbonate molten salt heat transfer and storage medium is prepared from K2CO3, Li2CO3, Na2CO3, AlCl3 and Al powder in percentage by mass, the Al powder and the AlCl3 powder are introduced into carbonate molten salt, the application target that the heat storage performance is excellent at the temperature of 600-850 DEG C can be achieved, and the heat transfer and storage efficiency of the carbonate molten salt is improved. And meanwhile, [Al] with considerable activity is generated by virtue of potential regulation capability of dissolved metal ions and gaseous chloride products by virtue of physical adsorption and chemical adsorption acting forces, so that the aim of reducing corrosion is fulfilled. The high-heat-capacity and low-corrosivity carbonate molten salt heat transfer and storage medium disclosed by the invention realizes the application goals of excellent heat storage performance and low corrosivity, is high in stability, simple in preparation process and easy for large-scale production, and can be applied to photo-thermal power generation and molten salt energy storage.