The invention discloses lemon blood-fat-lowering tablets and a preparation method thereof. The lemon blood-fat-lowering tablets are prepared from, by mass, 6-10 parts of lemon blood-fat-lowering extract, 1-3 parts of hawthorn fruit extract and 0.5-1 part of rhizoma curcumae longae. The preparation method comprises the steps that an appropriate amount of water is added to the lemon blood-fat-lowering extract, the hawthorn fruit extract and rhizoma curcumae longae, the materials are stirred, granulation is conducted, obtained granules are treated under the microwave condition and then dried, magnesium stearate is added, tabletting forming is conducted, treatment under the microwave condition is conducted, and the lemon blood-fat-lowering tablets are obtained. According to the lemon blood-fat-lowering tablets and the preparation method thereof, the blood-fat-lowering effective ingredient in immature lemon fruit is directly extracted and compounded with the hawthorn fruit extract and rhizoma curcumae longae, the materials are prepared into the blood-fat-lowering tablets, comprehensive nutrition and efficacy are obtained to the maximum extend, storing is facilitated, carrying is convenient, and the problem of turning the immature lemon fruit into treasure is solved. The lemon blood-fat-lowering tablets have the functions of lowering cholesterol, resisting oxidation, lowering blood sugar, resisting fungi and the like, and the health-care effect is significant.