The present invention provides a refrigerating and freezing device. A first sealed space (11) and a second sealed space (12) are disposed in a storage space inside the refrigerating and freezing device. The refrigerating and freezing device is further provided with a nitrogen generation device (13), which comprises an adsorption device (21) and an air compressor (20) that supplies compressed air for the adsorption device (21). The adsorption device (21) utilizes the compressed air to prepare nitrogen that is provided for the first sealed space (11) and an oxygen-enriched gas that is provided for the second sealed space (12). The freshness preservation capability of the first sealed space (11) is improved. The bioactivity of food in the second sealed space (12) is guaranteed.