The invention relates to a food and a preparing method thereof, in particular to multi-vitamin fruit vinegar and a preparing method thereof. The multi-vitamin fruit vinegar uses grapes, hawthorns and plums as main raw materials and is prepared by adding water, strong wine, sugar, monosodium glutamates, honey and salt. The grapes, the hawthorns and the plums are used as the main raw materials of the multi-vitamin fruit vinegar. The grapes are neutral in nature, have a sweet and sour taste, act on the lungs, the spleen and the kidney channel, and have the functions of supplementing qi and bloodand enriching the livers and the kidneys. The hawthorns contain multiple vitamins, tartaric acid, crataegolic acid and the like, and also contain flavonoid, lactone, glucide and mineral materials such as calcium, phosphorus, ferrum and the like. The plums have a sweet and sour taste, are cool in nature, can clear liver heat, engender liquid, clear the liver and disinhibit water. The plums have multiple amino acids such as glutamine, serine, glycin, proline and the like, are nutritious and have pharmacophagous double functions. The three fruits are combined to form a compound multi-vitamin green health food. Because no additive is added, multi-vitamin fruit vinegar is novel green drink and seasoning which are pure natural and have a unique taste.