Preparation method of tropaeolum oral liquid

The invention provides a tropaeolum extract and a preparation method of oral liquid medicine thereof. Tropaeolum raw material is taken and added with aqueous solution accouting for 25 times of medicinal material by weight so that the mixture is heated up till 95 DEG C when stirring, and stirring goes on for 40 minutes; the extract is centrifugalized to discard herb residues; the medical solution is frozen and concentrated till 10% of the total medical solution; macromolecular micelle of the medical solution is removed by centrifugation; the concentrated medical solution is the tropaeolum extract, and the tropaeolum extract is prepared into oral liquid by conventional method. The method of the invention uses dynamic extraction, thereby improving extraction efficiency and shortening extraction time; therefore, general flavone, vitexin and orientin in the medicinal material of tropaeolum are fully extracted, and the ineffective ingredients and impurities of the extracted macromolecular micelle are also correspon