Method for extracting active ingredients general flavone and terpene lactones in ginkgo leaf

The invention discloses a method for extracting active ingredients general flavone and terpene lactones in ginkgo leaf. The method comprises the following steps: dissolving ginkgo leaf powder in 70 percent ethanol, extracting in a thermostatic water bath at the temperature of 70 DEG C for 6 hours, centrifuging the supernatant to obtain a ginkgo leaf extracting solution; preparing an adsorption column by using a macroporous resin, filling the ginkgo leaf extracting solution into the adsorption column, performing full adsorption, allowing the ginkgo leaf extracting solution to naturally flow down, and collecting the eluant, thereby obtaining the ginkgo leaf extracting solution of low-concentration ginkgolic acid. According to the extracting solution obtained by the method, the content of general flavone is 24.36 percent, and the content of terpene lactones is 6.01 percent; and the concentration of eluted ginkgolic acid is reduced to 0.051mg/mL. The content of ginkgolic acid is greatly reduced under the conditio