The invention discloses purple sweet potato and vanilla flavored sandwiched 
wafer biscuits and a preparation method thereof. The purple sweet potato and vanilla flavored sandwiched 
wafer biscuits are prepared from cookie pieces and a stuffing, wherein the cookie pieces are mainly prepared from wheatmeal, purple sweet potato 
powder, 
rice flour, wheat starches, 
lotus leaf 
powder and radix puerariae 
powder; 
scutellaria baicalensis powder, radix polygonati 
officinalis powder and lily powder are added into the stuffing. The preparation method comprises the following steps: pretreating the raw materials, pulping and baking the cookie piece raw materials, preparing and molding the stuffing, and the like. Ingredients of the conventional 
wafer biscuits are changed, and various components are added, so that the taste is delicious. The purple sweet potatoes are added in the raw materials, and are enriched with proteins, starches, 
pectin, 
cellulose, 
amino acid, vitamins and various minerals, and 
selenium elements and 
anthocyanin, so that the wafer biscuits have the effects of resisting the 
cancer and protecting the health; by the adding of the 
scutellaria baicalensis powder, the radix polygonati 
officinalis powder and the lily powder, the wafer biscuits have extremely high medical value, so that the 
immunity of a 
human body is enhanced, and the nutritional 
health protection effect is good. The wafer biscuits are a bakery product integrating 
nutrition, leisure and 
health protection, and taste good; the preparation method is simple and convenient, and can realize 
batch production on an automatic 
production line.