A refrigeration and freezing device, comprising: a case body, wherein a storage space and a compressor compartment are defined in the case body, a storage container is disposed in the storage space, and a freshness preservation space is defined inside the storage container; a door body (21, 22, 23), disposed on a front surface of the case body to close the storage space; an oxygen-enrichment membrane assembly disposed at the storage container, a space around the oxygen-enrichment membrane assembly being communicated with the freshness preservation space, wherein the oxygen-enrichment membrane assembly has at least one oxygen-enrichment membrane and an oxygen-rich gas collection cavity, and is configured to enable more oxygen than nitrogen in an airflow in the space around the oxygen-enrichment membrane assembly to enter the oxygen-rich gas collection cavity through the oxygen-enrichment membrane; an air pump, disposed in the compressor compartment, wherein an inlet end of the air pump is communicated with the oxygen-rich gas collection cavity of the oxygen-enrichment membrane assembly via a pipe, so as to discharge gas that enters the oxygen-rich gas collection cavity from the storage container; and a refrigeration system, configured to supply cooled air to the storage space, so as to keep an actual temperature in the freshness preservation space within a range between 0 °C and 10 °C, characterized in that the oxygen-enrichment membrane assembly further comprises a support frame having a first surface and a second surface parallel to each other, wherein a plurality of airflow channels respectively extending on the first surface, extending on the second surface, and passing through the support frame to communicate the first surface with the second surface is formed on the support frame, and the plurality of airflow channels together forms the oxygen-rich gas collection cavity; and the at least one oxygen-enrichment membrane is two planar oxygen-enrichment membranes respectively laid on the first surface and the second surface of the support frame. a case body, wherein a storage space and a compressor compartment are defined in the case body, a storage container is disposed in the storage space, and a freshness preservation space is defined inside the storage container; a door body (21, 22, 23), disposed on a front surface of the case body to close the storage space; an oxygen-enrichment membrane assembly disposed at the storage container, a space around the oxygen-enrichment membrane assembly being communicated with the freshness preservation space, wherein the oxygen-enrichment membrane assembly has at least one oxygen-enrichment membrane and an oxygen-rich gas collection cavity, and is configured to enable more oxygen than nitrogen in an airflow in the space around the oxygen-enrichment membrane assembly to enter the oxygen-rich gas collection cavity through the oxygen-enrichment membrane; an air pump, disposed in the compressor compartment, wherein an inlet end of the air pump is communicated with the oxygen-rich gas collection cavity of the oxygen-enrichment membrane assembly via a pipe, so as to discharge gas that enters the oxygen-rich gas collection cavity from the storage container; and a refrigeration system, configured to supply cooled air to the storage space, so as to keep an actual temperature in the freshness preservation space within a range between 0 °C and 10 °C, characterized in that the oxygen-enrichment membrane assembly further comprises a support frame having a first surface and a second surface parallel to each other, wherein a plurality of airflow channels respectively extending on the first surface, extending on the second surface, and passing through the support frame to communicate the first surface with the second surface is formed on the support frame, and the plurality of airflow channels together forms the oxygen-rich gas collection cavity; and the at least one oxygen-enrichment membrane is two planar oxygen-enrichment membranes respectively laid on the first surface and the second surface of the support frame.