The invention discloses a method for estimating an actual blending ratio of cut reconstituted tobacco in cut tobacco of a cigarette. The method comprises the following steps of 1, testing the contentof nicotine and chlorine in cut lamina and the cut reconstituted tobacco; (2) calculating the content of nicotine and chlorine in a blended material according to a blending ratio; (3) quasi-testing the content of nicotine and chlorine in the cigarette; (4) calculating out an actual proportion of the cut reconstituted tobacco in the cut tobacco; and (5) judging the reliability of XN and XCl, and taking an average value of XN and XCl as an actual proportion X of the cut reconstituted tobacco in the cigarette. The method is free of modeling, simple and accurate; and a result is accurate and reliable.