The invention relates to a preparation method of a hair thickening liquid with anti-alopecia effect. The preparation method comprises the following steps of (1) weighing the following components in parts by weight: 5 to 35 parts of radix 
ginseng, 5 to 35 parts of Chinese arborvitae 
twig and leaf, 5 to 35 parts of fresh ginger, 5 to 55 parts of rhizoma alismatis, 5 to 25 parts of 
angelica sinensis,5 to 35 parts of radix languas galangal, 5 to 25 parts of 
radix astragali seu hedysari, 5 to 25 parts of cockscomb flower, 5 to 8 parts of 
cinnamon bark, 2 to 3 parts of 
tetrahydropiperine, and 2 to3 parts of 
menthol; (2) adding 5 to 25 times of 8-90 vol% 
ethanol aqueous solution by weight into the radix 
ginseng, the Chinese arborvitae 
twig and leaf, the fresh ginger, the rhizoma alismatis, theangelica sinensis, the radix languas galangal, the 
radix astragali seu hedysari, the cockscomb flower and the 
cinnamon bark, heating, refluxing and extracting for 2 to 3 h, filtering, concentrating the filtrate to the 
relative density of 1.02 at the temperature of 60 DEG C, adding the 
tetrahydropiperine and the 
menthol, and uniformly mixing, so as to obtain the hair thickening liquid with anti-alopecia effect. The hair thickening liquid with anti-alopecia effect has the advantages that the pure natural components are adopted, and the 
irritation effect is avoided; various types of alopecia canbe treated, and the effect is obvious; the cost is low, and the preparation technology is simple.