Preparation method of compound houttuynia mistura

The invention relates to a preparation method of a compound houttuynia mistura. The compound houttuynia mistura is prepared from the medicinal materials of houttuynia, honeysuckle flower, fructus forsythiae, radix scutellariae and isatis root. The preparation method of the compound houttuynia mistura comprises the steps of: decocting and extracting; centrifuging by a high-speed machine; centrifuging by the high-speed machine after alcohol precipitation; and flocculating and precipitating and preparing the mistura. In the preparation method provided by the invention, centrifugation by the high-speed machine is applied to replacing traditional conventional filtration, thus the impurity removal efficiency is improved; and macromolecular substances are removed by flocculating and precipitating, thus the precipitation problem of the compound houttuynia mistura after long-term storage is solved. Therefore, the prepared compound houttuynia mistura does not generate precipitates after long-term storage and the safety of the medicament is improved.