The invention relates to a method for preserving the fresh juice of citrus fruits or pomegranates following the conventional treatment of the fruit and corresponding extrusion or expression of same to obtain the juice. The method consists of: applying, prior to introducing the juice into a container, CO2 in the form of dry ice, which removes the oxygen content in the container； then introducing the juice continuously； subsequently adding, according to the characteristics of the juice, a dose of liquid nitrogen that allows the atmosphere of the headspace thereof to be corrected； and hermetically sealing the container, such that the absence of oxygen therein is ensured, preventing the product from oxidising and increasing the durability thereof, as long as said product is preserved at a final temperature between 1 and 4°C.
