Abstract: The invention relates to the chemical and pharmaceutical industry. The essence of the invention consists in that the bark is removed from Siberian or Dahurian larch wood, the wood is chopped and dried at 40-50° C. to a residual humidity of 15-25 percent. The dried wood is ground, and the soluble substances are extracted from the sawdust using a 75 percent aqueous solution of ethyl alcohol at a temperature of 40-50° C. with a ratio of raw material to extraction agent of 1:(6-7). The extraction agent is then distilled off, and the aqueous portion of the extract is cooled to 38-42° C. over a period of 20-30 minutes for the removal (sedimentation) of the heavy resinous impurities accompanying the DHQ. The resin-free aqueous DHQ extract is fed into a chromatographic column filled with the hydrophobic polyvinyl benzene-based sorbent LPS 500. The desired product is eluted with a 32-40 percent solution of ethyl alcohol.