[Machine Translation of Descriptors]. The present invention proposes a concd. red cabbage juice product and its prepn. method, including prepg. of cabbage purple slurry by breaking cabbage purple after adding water, heating of the slurry, enzymolysis of the slurry, squeezing, enzymolysis, filtration and concn. to get the finished product of concd. purple cabbage juice; the method is characterized by adding citric acid before breaking for color protection, heating purple cabbage slurry for passivation of enzymes and adding enzymes for increasing juice yield while facilitating extn. of anthocyanin to obtain a red cabbage juice with a high anthocyanin content.