The invention discloses a method for measuring absorption rate and effective absorption ratio of feed liquid of a flue-cured tobacco lamina. The method comprises the following steps: processing a sample before testing, digesting the sample, extracting the sample, carrying out CS-MS (Gas Chromatography-Mass Spectrometry) detection, expressing the detection result, and calculating. According to the invention, a method for effectively separating feed liquid on the surface of the flue-cured tobacco lamina from the feed liquid in the flue-cured tobacco lamina is established; the process of the flue-cured tobacco lamina absorbing the feed liquid is quantified; a concept of the absorption rate of the feed liquid in the flue-cured tobacco lamina is proposed, and the calculation method is established; the new basis is provided for adjusting and optimizing feeding and tobacco storing technological parameters; the concept of full absorption of the feed liquid is quantified; the concept of effective absorption ratio of the feed liquid in the flue-cured tobacco lamina is proposed; and the calculation method of the effective absorption ratio of the feed liquid in the flue-cured tobacco lamina is established.