The invention discloses a meadowrue corydalis root beverage. The meadowrue corydalis root beverage is prepared from, by weight, 50-80 parts of a component A, 0-20 parts of saccharose and 30-50 parts of cyclodextrin. The component A is water extract of a mixture of 20-40 parts of meadowrue corydalis roots, 10-30 parts of sweet tea, 20-50 parts of grosvener siraitia and 20-40 parts of licorice roots, wherein the grosvener siraitia in the mixture is a baked product, and other raw materials are dried until the water content is 10%. The meadowrue corydalis root beverage is good in taste, has the effects of clearing away heat and toxic materials, removing dampness by dieresis, moistening the lung, relieving sore throat and expelling phlegm to arrest coughing, can treat hepatitis, erosion of mucous membrane in the oral cavity, sphagitis, amygdalitis, an eye inflammation, corneal opacity, dysentery, diarrhea, stomachache, acute gastritis, constipation, hemorrhoidal bleeding and the like and has an nutrition and healthcare effect. The product without saccharose is particularly suitable for obese groups and diabetics, can lose weight and reduce lipid and can be drunk by patients with cardiovascular diseases, the obese groups and the diabetics. The invention further provides a preparation method of the meadowrue corydalis root beverage.