The invention provides a modeling method of a traditional Chinese medicine astringency evaluation model. The modeling method comprises the following steps: a, selecting tannic acid as an astringency reference substance, and dissolving the tannic acid into deionized water; b, determining a preference index by adopting a two-bottle preference test; c, fitting the preference index with the concentration of the tannic acid, thus obtaining a Log2P2 model, wherein a concentration-preference index equation is Y=ln(1.6826-0.44166X), Y represents the preference index, and X represents the concentration of the tannic acid. The invention provides a unified quantization and evaluation method for the astringency of traditional Chinese medicine. According to the modeling method provided by the invention, by using the tannic acid as the astringency reference substance, the astringency of the traditional Chinese medicine is unifiedly quantified, and the accuracy degree is high; through establishment of the modeling method, a reliable tool is provided for accurate quantization on the astringency of the traditional Chinese medicine and objective evaluation on a taste masking effect, and a new idea and a new example are also provided for quantization and evaluation on other gustation in the field of medicine and food.