The invention discloses a method for preparing
polyethylene glycol 12-hydroxy
stearate-containing danshen root medicament injection preparation. The preparation method comprises the following steps: adding water to 1500g of the root of red-rooted
salvia and boiling for three times, the first time being 2h, the second time and the third time each being 1.5h, combining the boiled liquid, filtering, concentrating under decompression to 750ml, adding
alcohol and precipitating twice, the
alcohol content in the first time being 75% and in the second time being 85%, each all filtering after refrigerating, recovering the
alcohol from filtrate and concentrating to 250ml, adding injection water to 400ml, blending, refrigerating, filtering, adjusting pH value to 6.8 by using 10% of
sodium hydroxide solution, boiling for half an hour, filtering, adding 2.0g of
polyethylene glycol 12-hydroxy
stearate to the filtrate, and adding the injection water to 1000ml, mixing uniformly, adjusting the pH value to 6.8 by using the 10% of the
sodium hydroxide solution, filtering, embedmenting, sterilizing and obtaining the product. The method of the invention solves the problems of easy
precipitation and opacities during the storage and high temperature sterilization processes of the root of red-rooted
salvia injection with satisfaction.