The invention provides a medlar plant functional beverage which is a new plant functional beverage by taking the medlar as a main raw material and taking water, white granulated sugar, sodium carboxymethyl cellulose, xanthan gum, agar, citric acid, sodium citrate, D-sodium ascorbate, ethyl maltol and eatable medlar essence as auxiliary materials. The medlar plant functional beverage is prepared by grinding the medlar to be paste, mixing, pasteurizing, emulsifying, instantly sterilizing at high temperature, homogenizing under high pressure, thermally filling, and cooling. The medlar plant functional beverage can provide the water, sugar, protein, vitamin, various mineral substances, amino acid and medlar acid, has the functions of non-specific immunity, blood glucose reduction, liver protection, fatty liver prevention, appetite whetting and phosphorus digestive absorption facilitation, facilitates a hematopoietic function, and can moisten the lung and promote the secretion of saliva, relieve the cough, regulate the middle warmer and tonify the lung, release the liver qi, nourish the yin, season, remove the ozostomia and detoxify the bittern poison; the medlar-containing plant functional beverage has the characteristics that the raw materials are natural or are extracted from natural plants, the mouthfeel is good, the appetite can be whetted, the nutrition is abundant and the functionality is strong.