The invention relates to a process for producing
ginkgo extract and belongs to the technical field of plan extraction. The process comprises the following steps of: adding
ginkgo leaves serving as raw materials into 50 to 70 percent
ethanol of which the weight is eight times that of
ginkgo leaves serving as the raw materials to perform leaching three times, wherein the leaching temperature is 70 DEG C; collecting extracting solution, evaporating the extracting solution under vacuum, recovering
ethanol, centrifuging the extracting solution and collecting supernatant solution; and subjecting the extracting solution to the centrifugal treatment by a
macroporous resin chromatographic column of which the
diameter-to-height ratio is 1:10, leaching the extracting solution in turn with 5 to 15 percent
ethanol until the eluate is clear and bright, desorbing the extracting solution with 75 percent ethanol, after
desorption, collecting desorbing solution, allowing the desorbing solution to pass through a
macroporous resin chromatographic column of which the
diameter-to-height ratio is 1:30, collecting the desorbing solution, decompression-recovering ethanol, condensing the desorbing solution into thick paste, and vacuum-
drying the thick paste to obtain the ginkgo extract. The process adopts multiple leaching and multistage centrifuging, and also adopts a double-time desorbing method of coarse extraction and refined extraction, so that the contents of the
active components are greatly improved; and the ginkgo extract with different ratios of
active components can be prepared as required.