The invention discloses refrigerator, the refrigerator-freezer of a kind of band nitrogen fresh-keeping function, the refrigerator, refrigerator-freezer are attached to miniature PSA(pressure-variable adsorptions) or membrane separation nitrogen making machine. Using carbon molecular sieve to this characteristic of the difference of oxygen and N2 adsorption amount, pass through MCU(microprocessors) or PLC(logic control circuits) automatically control pressurized adsorbent, the cyclic process of normal pressure parsing or hollow fiber film assembly, the nitrogen of high-purity needed for being enriched with, and it can be according to different requirements, pass through refrigerator, control panel on refrigerator-freezer be arranged and control nitrogen making machine working condition and indoor nitrogen gas concn, with general refrigerator, except the strength cold storage function of refrigerator-freezer, nitrogen preservation food can be utilized again, especially vegetable, fruits, it is practical and convenient, user is allowed to eat to obtain fresh food, it is family, food business shop, the ideal product of the food fresh-keepings such as catering trade and place of public amusement.
