Flue-cured tobacco upper leaf maturity colorimetric card

The utility model discloses flue-cured tobacco upper leaf maturity colorimetric card. The colorimetric card comprises a panel and a bottom plate, wherein one end of the panel is connected with one end of the bottom plate; and the panel is provided with a leaf surface color zone, a main vein color zone and a branch vein color zone; and a colorimetric hole is formed in the center of each color lump on each color zone. The leaf surface color zone, the main vein color zone and the branch vein color zone on the colorimetric card can be used for determining the mature situation of the leaf surface, the main vein and the branch vein of flue-cured tobacco, and determining the best harvest opportunity. When the flue-cured tobacco upper leaf maturity colorimetric card is used, the tobacco leaf can move between the panel and the bottom plate, contrast of leaf and color lump colors can be more intuitively observed by virtue of the colorimetric card in the center of each color lump; and compared with traditional visual inspection to tobacco leaf color maturity, the colorimetric card can be used for quickly obtaining color situations of different parts of tobacco leaves along with higher accuracy.