The invention provides a refrigerating and freezing device and a storage container thereof. The storage container comprises an electrolysis deoxygenization assembly and a moisture permeability assembly. The electrolysis deoxygenization assembly is used for consuming oxygen in air in a storage space, so that a nitrogen-rich oxygen-deficient air atmosphere beneficial to food preservation is obtainedin the space, the intensity of aerobic respiration of food is reduced, and the aim of long-term preserving the food is achieved. When the electrolysis deoxygenization assembly is used for consuming the oxygen in the storage space, a certain moisture is produced in the storage space, so that the inner part of the storage space is more and more humid. Through the moisture permeability assembly, themoisture in the air in the storage space can be conveyed to the outer part of the space through a pervaporation membrane through vaporization penetration, so that the humidity in the storage space still keeps in the appropriate range, and condensate or dropping water is prevented from being produced in the space. In the refrigerating and freezing device provided by the invention, the electrolysisdeoxygenization assembly and the moisture permeability assembly can be used in a matching way, so that food can be preserved favorably.