Functional beer and brewing method thereof

The invention discloses a functional beer and a brewing method thereof. The brewing method of the functional beer uses malt, rice, hops, yeast and a raw material containing anthocyanin, and comprises the steps of: pulverizing, pasting, saccharifying, filtering, boiling, adding the hops, carrying out rotary settling, cooling, pre-fermenting, after-fermenting and storing in a cold condition to obtain the functional beer in which the content of anthocyanin is 0.2-0.5 mg/L. By the brewing method disclosed by the invention, the beer containing purple sweet potato is produced, the content of nutrient anthocyanin in the functional beer is improved, and simultaneously, the beer is easy to store and preserve and has a better taste due to a certain antibacterial effect of purple sweet potato pigment.