The invention discloses blood pressure lowering health care green tea and its preparation method. The method comprises: mixing 15-30 parts by weight of white tea, 20-25 parts by weight of zinc-selenium tea, 20-25 parts by weight of green tea, 20-30 parts by weight of baked green tea or Maofeng tea, 5 parts by weight of folium llicis latifoliae, and 5 parts by weight of chrysanthemums, wherein, the free amino acid content of the white tea is over 7%, the zinc-selenium tea has Zn content of 80-120mg / kg and Se content of 0.25-0.35mg / kg, the green tea has free amino acid content of more than 5%, and the baked green tea or Maofeng tea has tea polyphenol content of over 30%; then mixing the well mixed tea with crushed kenaf accounting for 20-30 wt% of the mixed tea uniformly, and storing the mixture for 30-60d, then conducting screening to filter out kenaf, and carrying out fragrance increasing at a temperature of 150DEG C for 10-12min, and performing depilation at a temperature of 110DEG Cfor 12-15min, thus obtaining the product. With high content of water extract, tea polyphenol and amino acid as well as low caffeine, the health care green tea of the invention plays an active role inprotecting a normal ultrastructure of the cardiac muscle.