The invention discloses a method for evaluating the quality stability of redried finished sheet tobacco. The method comprises the following steps of: converting a qualitative description of the appearance color of the tobacco into quantifiable constant indexes L*(lightness value), a*(red and green value) and b*(yellow and blue value) based on the CIE1976L*a*b*color space; constructing a mean value and Xmax-Xmin graph (X-Rs control graph) by checking the normal distribution conformance of data of the L* value, the a* value and the b* value of the tested tobacco; and calculating a process capability index Cp of each index to determine the quality stability of the redried finished sheet tobacco. If the process capability indexes of the L* value, the a* value and the b* value meet the condition that Cp is greater than 1.00 and less than or equal to 1.33, the quality of the redried finished sheet tobacco is in a stable state, otherwise, the quality stability of the redried finished sheet tobacco is relatively low. By the method, the problem of limitation that the quality stability of the conventional redried finished sheet tobacco is only evaluated by subjective evaluation; and the method has the characteristics of simplicity in operation, reliable result and high adaptability.