The invention discloses a preparation method of a botanical solid beverage. The botanical solid beverage is prepared from the following raw materials in parts by weight: 0.5-1.5 parts of rose flower, 0.5-1.5 parts of fructus jujubae, 0.5-1.5 parts of fructus crataegi, 0.05-0.2 part of fruit of mulberry, 0.1-0.5 part of liquorice root, 0.1-0.5 part of black tea, 0.5-1.5 parts of maltodextrin, 0.5-3 parts of fructose and 0.01-0.05 part of stevioside. The preparation method of the botanical solid beverage comprises the following steps: crushing the rose flower, collecting aroma water in advance, extracting filtrate from rose flower residues, then extracting the rose flower residues and other materials with water, crushing the black tea and the fructus jujubae, and then extracting by using a microwave extraction process. The method can be used for effectively retaining natural aroma and original taste of the rose flower, the black tea and the fructus jujubae and also protecting tea polyphenol heat-sensitive components to a maximum limit; the botanical solid beverage prepared by the method is rich in aroma, sweet and sour in mouthfeel, rich in taste and unique in flavor, and has heath care effects of maintaining beauty, nourishing qi and blood, tonifying spleen, promoting digestion and the like.