The invention discloses an oral liquid containing cinnamon, processed
aconite root and prepared
rehmannia root. A preparation method of the oral liquid comprises the following steps of: respectively uniformly mixing prepared
rehmannia root
powder,
wine-prepared cornus
powder and tree peony
bark powder with a mixture of water,
cane sugar and rice
bran; sterilizing; cooling; inoculating a leaveningagent; fermenting and
drying to obtain fermented prepared
rehmannia root, fermented
wine-prepared cornus and fermented tree peony
bark; crushing cinnamon and fermented tree peony
bark, and carrying out
supercritical carbon dioxide extraction to obtain volatile oil and decoction dregs A; adding an
ethanol solution into the fermented
wine-prepared cornus, carrying out
reflux extraction, and filtering to obtain filtrate A and decoction dregs B; crushing Chinese yam and poria cocos, adding water, and carrying out
reflux extraction to obtain filtrate B and decoction dregs C; crushing processed
aconite root, rhizoma alismatis, decoction dregs A, decoction dregs B, decoction dregs C and fermented prepared
rehmannia root, adding
ethanol for soaking, and sequentially carrying out ultrasonic and high-
voltage pulsed
electric field extraction to obtain filtrate C and decoction dregs D; adding water into the decoction dregs D, and decocting to obtain filtrate D; and mixing the filtrates with the volatile oil, concentrating, adding
ethanol, standing, filtering, recovering ethanol, refrigerating, filtering, adding auxiliary materials, uniformly stirring, adding water, and uniformly stirring.