The invention discloses a method for determining parts of flue-cured tobacco. The method is used for directly determining the characteristics of tobacco leaves with different qualities through a measuring method, calculating the scale values of the parts of the leaves and then accurately determining growth parts of the tobacco leaves according to the sizes of the scale values, and each tobacco leaf can be accurately divided into a lower part, a middle part and an upper part. According to the method, the defects of current experiential sense judgment methods such as viewing, touching and smelling and the defect that the parts of the tobacco leaves are described and judged by using a qualitative and inaccurate natural language with extension fuzziness are overcome, and the problems of low speed and inaccuracy in determination of the parts of the flue-cured tobacco are solved. The method has the advantages that the operation process is simple and convenient; the accuracy is high; the repeatability is higher; equipment is simple, that is only a ruler of which the accuracy reaches 0.1cm is needed; the operability is high; requirements on the experience of technical staff are reduced, and the growth parts of the tobacco can be quickly and accurately determined.