The invention discloses low-fat roxburgh rose tea cake premixed powder which is characterized by comprising a powder bag, a milk bag and an oil bag, the powder bag comprises the following raw materials in parts by weight: 130-160 parts of whole wheat flour, 5-15 parts of roxburgh rose powder, 3-6 parts of green tea powder, 15-25 parts of black sesame, 1-3 parts of baking soda and 1-3 parts of salt; a milk bag: 50-80 parts of skim milk; and an oil bag: 20-30 parts of olive oil. The invention further discloses application of the low-fat roxburgh rose tea cake premixed powder to preparation of low-fat roxburgh rose tea cakes. The roxburgh rose tea biscuit prepared by combining the roxburgh rose tea biscuit premixed powder is delicious and low in grease content, and has functional components of natural roxburgh rose and green tea powder.