A refrigeration and freezing device, an internal storage space of which is provided with a first sealed space (11) and a second sealed space (12). The refrigeration and freezing device is provided with a nitrogen-producing means (13), which comprises an adsorption means (21) and an air compressor (20). The air compressor (20) supplies compressed air to the adsorption means (21); the adsorption means (21) uses the compressed air to produce nitrogen to be supplied to the first sealed space (11) and oxygen-enriched gas to be supplied to the second sealed space (12). The device improves the fresh-preservation capability of the first sealed space (11) and guarantees the bioactivity of food stored in the second sealed space (12).