The invention discloses a 
plant extract composition functioning as a dustman of blood vessels and a preparation method thereof. The 
plant extract composition mainly comprises 
plant raw materials and an extract, wherein the raw materials include the following components according to parts by weight: 10 to 30 parts s of dyers woad leaves, 15 to 35 parts of 
cassia seed, 10 to 20 parts of inular flowers, 15 to 30 parts of safflower, 10 to 30 parts of chrysanthemum and 20 to 50 parts of 
apocynum; and the extract includes the following components according to parts by weight: 20 to 40 parts of gingko flavone, 20 to 35 parts of 
rheum emodin, 30 to 50 parts of crataegin, 15 to 55 parts of gypenoside and 20 to 60 parts of 
panax notoginseng saponins. The plant raw materials are processed by the operations of pulverization, 
steeping, ultrasonic extraction, separation, 
filtration, PH value adjustment and concentration; then, the extract is added to the plant raw materials. The product obtained by 
drying the mixture of the plant raw materials and the extract can increase the level of the 
high density lipoprotein in blood, smoothen and soften the blood vessels, lower the 
blood viscosity, and function as the dustman of blood vessels.