The invention discloses a mandarin duck egg formula. The mandarin duck egg formula comprises the following components by weight: 5 kilograms of food grade sodium carbonate, 5.5 kilograms of edible salt, 0.2 kilogram of monosodium glutamate, 0.25 kilogram of anise, 0.2 kilogram of kaempferiae rhizoma, 0.5 kilogram of red dried orange peel, 1.5 kilograms of old ginger, 0.3 kilogram of garlic, 100 kilograms of fresh eggs, and a proper amount of drinking water. The preparation method of mandarin duck egg comprises the following steps: (1) choosing raw materials; (2) putting the chosen fresh eggs into a container; (3) evenly grinding and stirring flavorings, boiling the flavorings by slow fire, cooling, and adding food grade sodium carbonate; (4) adding the processed raw materials into the fresh eggs, covering the fresh eggs by a thick plastic film, and adding drinking water until the drinking water and the opening of the container are in the same plane; (5) sealing the container, and storing the container; (6) performing aeration-drying; (7) boiling, cooling, naturally drying, performing vacuum package, and selling the finished products. The production technologies of lead-free preserved eggs and salted eggs are modified to produce the mandarin duck egg, which is novel, fashion, healthy, green, and leisure, and have the functions of promoting appetite and developing the intelligence.