The invention discloses a preparation method of a
sodium ferulate freeze-dried
powder injection, comprising the following steps of: (a) firstly, adding water for injection, with the volume being about 80 percent of the pre-compounding volume, into a compounding tank, controlling the
water temperature at 15-20 DEG C, adding raw
sodium ferulate
powder, detecting a pH value, and enabling the pH value to be between 6.8 and 7.2; adding
activated carbon, replenishing water to reach a certain volume, stirring, decoloring, removing pyrogen, filtering, detecting the content and split charging; and (b), carrying out
freeze drying according to the following steps of, firstly, pre-freezing: placing a product on a
clapboard of a
freeze drying box, cooling the product to 40-45 DEG C below zero, keeping the temperature for 4-6h; secondly, sublimating: heating the product to 4-6 DEG C below zero, keeping the temperature for 1h, cooling to 40-45 DEG C below zero, and keeping the temperature for 2-3h; and thirdly, separating out and
drying. A technical formula of the method does not contain any
excipient or other adjuncts and only contains
ferulic acid sodium. The prepared preparation has loose texture, good resolubility and strong stability.