A refrigerating and freezing device, comprising: a cabinet body with a first storage space defined therein, wherein a storage container in which an atmosphere-controlled freshness-keeping space is formed is disposed in the first storage space, wherein the storage container is a drawer assembly which comprises a barrel disposed in the first storage space and a drawer slidably mounted in the barrel to be operatively withdrawn from and inserted into the barrel from a forward opening of the barrel; an oxygen-enriched membrane assembly having at least one oxygen-enriched membrane and an oxygen-enriched gas collection chamber, wherein the space around the oxygen-enriched membrane assembly is communicated with the atmosphere-controlled freshness-keeping space, and the oxygen-enriched membrane assembly is configured such that more of oxygen than nitrogen in airflow in the space around the oxygen-enriched membrane assembly enters the oxygen-enriched gas collection chamber through the oxygen-enriched membrane; and an air extraction device communicated with the oxygen-enriched gas collection chamber through a pipeline to extract and discharge the gas that permeates into the oxygen-enriched gas collection chamber out of the storage container; characterized in that a receiving chamber communicated with the atmosphere-controlled freshness-keeping space is formed in a top wall of the barrel, and the oxygen-enriched membrane assembly is disposed in the receiving chamber, wherein at least one first vent and at least one second vent spaced from the at least one first vent are formed in a wall surface, between the receiving chamber and the atmosphere-controlled freshness-keeping space, of the top wall to respectively communicate the receiving chamber with the atmosphere-controlled freshness-keeping space in different positions; and in that the refrigerating and freezing device further comprises a fan, wherein the fan is disposed in the receiving chamber to enable the gas in the atmosphere-controlled freshness-keeping space to sequentially pass through the at least one first vent, the receiving chamber and the at least one second vent and then to return to the atmosphere-controlled freshness-keeping space. a cabinet body with a first storage space defined therein, wherein a storage container in which an atmosphere-controlled freshness-keeping space is formed is disposed in the first storage space, wherein the storage container is a drawer assembly which comprises a barrel disposed in the first storage space and a drawer slidably mounted in the barrel to be operatively withdrawn from and inserted into the barrel from a forward opening of the barrel; an oxygen-enriched membrane assembly having at least one oxygen-enriched membrane and an oxygen-enriched gas collection chamber, wherein the space around the oxygen-enriched membrane assembly is communicated with the atmosphere-controlled freshness-keeping space, and the oxygen-enriched membrane assembly is configured such that more of oxygen than nitrogen in airflow in the space around the oxygen-enriched membrane assembly enters the oxygen-enriched gas collection chamber through the oxygen-enriched membrane; and an air extraction device communicated with the oxygen-enriched gas collection chamber through a pipeline to extract and discharge the gas that permeates into the oxygen-enriched gas collection chamber out of the storage container; characterized in that a receiving chamber communicated with the atmosphere-controlled freshness-keeping space is formed in a top wall of the barrel, and the oxygen-enriched membrane assembly is disposed in the receiving chamber, wherein at least one first vent and at least one second vent spaced from the at least one first vent are formed in a wall surface, between the receiving chamber and the atmosphere-controlled freshness-keeping space, of the top wall to respectively communicate the receiving chamber with the atmosphere-controlled freshness-keeping space in different positions; and in that the refrigerating and freezing device further comprises a fan, wherein the fan is disposed in the receiving chamber to enable the gas in the atmosphere-controlled freshness-keeping space to sequentially pass through the at least one first vent, the receiving chamber and the at least one second vent and then to return to the atmosphere-controlled freshness-keeping space.