The invention provides a refrigerating and freezing device. The refrigerating and freezing device comprises a box body, a gas separator and a sucking pump, wherein storage spaces are defined in the box body, storage containers are arranged in the storage spaces, and gas regulating freshness retaining spaces are arranged in the storage containers; the gas separator is provided with a gas regulating film, a first gas collection cavity and a second gas collection cavity, the gas regulating film is configured into a manner that more oxygen, relative to nitrogen in air, in air in the first gas collection cavity penetrates the gas regulating film to enter the second gas collection cavity, the first gas collection cavity is controlled to communicate with storage chambers so that the air in the storage chambers can enter the first gas collection cavity, the first gas collection cavity is further controlled to communicate with the gas regulating freshness retaining spaces so that other gas, without the gas entering the second gas collection cavity through the gas regulating film, in the air entering the first gas collection cavity can enter the gas regulating freshness retaining spaces; and the sucking pump communicates with the second gas collection cavity through a pipeline so that the gas penetrating the second gas collection cavity can be promoted to be extracted out of the gas separator.