The invention discloses a probiotics microcapsule capable of keeping activity of strains and a preparation method thereof. The probiotics microcapsule is of a composite
wall material structure which is composed of a first
wall material and a second
wall material, wherein the first wall material is
protein plant polysaccharide complex gel which is prepared from
casein, malt extract and
xylooligosaccharide, can effectively block damages, on a core material, of light, heat,
oxygen,
metal ions and the like, and achieves positive promoting effect on stability of an embedded material; the second wall material is a
plant polysaccharide composite which is prepared from
tremella polysaccharide, rhizoma bletillae polysaccharide, bighead atractylodes
rhizome polysaccharide,
guar gum and
pectin, and can greatly reduce influences, on
biological activity of probiotics strains of the core material, of a vacuum freeze-
drying and
processing process; and meanwhile, when the second wall material coats the first wall material, the first wall material containing a great number of proteins can improve film-forming property and embedding effect of the second wall material, so that the performance of thecomposite wall material is integrally improved, and therefore, the composite wall material can protect the
biological activity of the core better, and remarkably improves the stability of the core material.