Method for preparing medicinal tea for preventing upper respiratory tract infection

The invention discloses a method for preparing medicinal tea for preventing upper respiratory tract infection. The medicinal tea is prepared from the following raw materials: caryopteris incana, holy basil, honeysuckle, mulberry leaf, almond, dendrobe, centipeda minima, eucalyptus leaf, alpine swertia and tea. The method is characterized by comprising the following steps of: performing supercritical carbon dioxide circulating countercurrent extraction on eucalyptus leaf, caryopteris incana, centipeda minima, dendrobe, honeysuckle and holy basil to obtain mixed volatile oil for later use; and performing water extraction on diamond, mulberry leaf, alpine swertia and tea and then concentrating, cooling to the temperature of between 40 and 50 DEG C, adding the mixed volatile oil under stirring, mixing uniformly, drying, crushing, and thus obtaining granules. Clinical research proves that the medicinal tea prepared by the method has the characteristics of good effect and high safety.