The invention relates to the field of functional tea, in particular to medicine and food homology functional tea and a preparing method thereof. The medicine and food homology functional tea is prepared from, by weight, 5-10 parts of radix pueraiae, 3-7 parts of mulberry, 4-8 parts of fructus lycii, 1-5 parts of seabuckthorn fruits, 1-5 parts of flos chrysanthemi and 0.1-0.5 part of stigma croci. The medicine and food homology functional tea is prepared through drying, smashing, granulation and subpackaging. Based on pathogenesis, six medicine and food homology medicines including seabuckthorn fruits which can enhance immunity and regulate in-vivo metabolic function, flos chrysanthemi which can elevate clear qi to lower turbid qi and reduce blood pressure, fructus lycii which can tonify kidney to strength the body and balance blood glucose, and the stigma croci which can promote blood circulation to remove blood stasis and achieve beautifying and defatting are carefully selected, and blood glucose reduction, lipid reduction and blood pressure reduction effects are remarkable through accurate component matching and scientific nursing. The medicine and food homology functional tea is easy to prepare and is packaged in bags so as to be taken and eaten conveniently.