The invention provides a method for preparing eight-treasure granules. The method comprises the following steps: eight medical materials such as radix codonopsis and bighead atractylodes rhizomes are prepared into Chinese herbal pieces as requested; the angelica sinensis, the ligusticum wallichii and the roasted bighead atractylodes rhizomes are extracted through ethanol reflux after being mixed and ethanol is recovered; the dregs of the decoctions of the angelica sinensis, the ligusticum wallichii and the roasted bighead atrac tylodes rhizome are added with water and then are decocted, wherein the dregs are continuously extracted through the ethanol at a low temperature; the remaining five Chinese herbal pieces such as the radix codonopsis, the Indian buead, the prepared rehmannia roots and the honey-fried licorice roots are added with water and then are decocted; the extracted solutions are mixed and then are concentrated into extractum with a hot test density of 1.08 to 1.20; the extractum is added with ethanol for ethanol precipitation and stilly placed; the supernatant are taken away, the ethanol is recovered, then the solution is concentrated into extractum with a hot test density 1.35-1.38; the extractum is added with auxiliary materials to be made into sugary granules and sugarless granules. According to the method, drug effective ingredients are reserved to the maximum extent; the quantity of the extractum extracted from the eight treasures are remarkably reduced; the problems that in the actual production process, prepared agents are difficult to form and the original technology is susceptible to moisture absorption and caking are solved, so that the method is suitable for industrial production and enables the quality of the drug more stable.