The present invention is freeze dried ligustrazine hydrochloride preparation for injection and its preparation process, and features that the freeze dried ligustrazine hydrochloride preparation contains the main medicine material ligustrazine hydrochloride in 5-100 wt% and supplementary material of at least one of mannitol, sorbitol and dextran in 0-95 wt%. The preparation process includes the following steps: 1. adding the main and supplementary material as well as water for injection into some container, heating to 35-40 deg.c and stirring for dissolving; and 2. adding active carbon into the solution, stirring, filtering, straining with microporous filtering membrane, measuring ligustrazine hydrochloride content, packing, etc. The freeze dried ligustrazine hydrochloride preparation for injection has long effective period over three years. |