Plant root probiotic preparation process

The invention discloses a preparation process of plant probiotics, and belongs to the field of plant probiotics, purple sweet potatoes are used as core materials, sodium alginate and whey protein are used as wall materials, and the purple sweet potatoes and probiotics are embedded by a reverse method to prepare probiotic purple sweet potato crystal balls, so that the defect that the number of the probiotics is reduced due to gastric acid and bile can be overcome, and the yield of the probiotics is improved. And a unique taste can be provided for consumers. According to the optimal process for preparing the purple sweet potato coating powder, the addition amount of whey protein is 7.00%, the addition amount of calcium lactate is 0.40%, the addition amount of sodium alginate is 2.0%, the probiotic purple sweet potato crystal balls are obtained after forming, the embedding rate of the probiotic purple sweet potato crystal balls is measured to be 76.72%, and the sensory score of the probiotic purple sweet potato