The invention discloses dihydromyricetin soft capsules and a preparation method thereof. The content of the dihydromyricetin soft capsules are prepared from the following raw materials in percentage by weight: 10 to 15 percent of dihydromyricetin and 85 to 90 percent of diluent, wherein the diluents is one or more of vegetable oil, polyethylene glycol and propylene glycol. The preparation method comprises: heating the diluent; adding dihydromyricetin powder formed by ball milling and by sieving with an 80-mesh sieve into the diluent; keeping the temperature after thermal dissolution is finished; and filling into soft capsule shells made from size, plasticizer, purified water and additive, sizing and drying. The dihydromyricetin soft capsules have functions of resisting oxidation, eliminating free radicals in human bodies, diminishing inflammation, relieving pain, reducing blood pressure, reducing fat, resisting tumor, relieving alcoholism, preventing alcoholic liver and fatty liver, inhibiting liver cell deterioration, reducing liver cancer morbidity and the like. The special formula of the capsule shells contributes to the quick dissolution of the capsules, so the content of the capsules can be absorbed by human bodies. The soft capsules are convenient to take.