Chinese thorowax root and asarum cold injection preparation method

The invention discloses a Chinese thorowax root and asarum cold injection preparation method which includes the steps: distilling Chinese thorowax root, asarum and water; collecting distillation liquid; redistilling the distillation liquid; collecting redistilling liquid; splitting oil layers; adding propylene glycol to dissolve volatile oil; uniformly mixing the dissolved volatile oil and the redistilling liquid with the split oil layers; adding sodium chloride into the mixed liquid; adjusting a pH (potential of hydrogen) value to 6.0-7.5 by the aid of alkaline solution; adding injection water to reach a specified amount; continuing adding 0.05%-0.5% of activated carbon; sufficiently mixing, filtering, potting and sterilizing the solution to obtain Chinese thorowax root and asarum cold injection.