Plant miticide derived from artemisia annul l and method for preparing the same

The invention relates to a plant source acaricide made from the artemisia annua L. The invention has the artemisia annua L. extract as the main ingredient, together with additional synergist, emulsifying agent and dispersing agent, wherein the percentage by weight of the artemisia annua L. extract which consists of terpenoids, flavonoids and volatile oil compounds is 1 to 15 percent of the mixture. The acaricide is capable of being used to control phytophagous mites harming vegetables, oranges and apples and wheat mites hidden in food, in particular to control carmine spider mite, citrus red mites and copra mites; therefore, the invention has the advantages of high efficiency, low toxicity and no environmental pollution, and does not harm the quality of agricultural products. In addition, the invention also relates to the method of preparation of the plant source acaricide.