The invention belongs to the technical field of food processing and particularly relates to a natural food preservative which comprises nisin, natamycin, kojic acid, seaweed extract, tea polyphenols and water. The ingredients are respectively, by mass parts, 2-7 parts of nisin, 8-11 parts of natamycin, 7-12 parts of kojic acid, 12-16 parts of seaweed extract, 4-10 parts of tea polyphenols and 80-100 parts of water. The used ingredients such as nisin, natamycin, kojic acid, seaweed extract, tea polyphenols, water, essential oil, D-erythorbic acid and allicin can be widely applied to foods and have effects of preservation; the main ingredients are natural ingredients such as nisin, natamycin, kojic acid and comprise extracts of natural plants, so that it can be guaranteed that even if the eating amount is high, no large damage is caused to health of consumers, and the natural ingredients are better in preservative effect.