Preparation method of acetylated distarch adipate starch

The invention provides a preparation method of acetylated distarch adipate starch. The preparation method is characterized by comprising the following steps: preparing starch milk, adding alkaline liquor, stirring, adding oxalic anhydride and acetic anhydride for reaction after vacuumizing, washing, dehydrating and drying after neutralization, and discharging the materials. According to the preparation method of acetylated distarch adipate starch, oxalic anhydride is difficultly converted into oxalic acid by heating and vacuum conditions, and even partial oxalic anhydride which has been converted into oxalic acid also reacts to generate oxalic anhydride, thereby ensuring the efficient crosslinking reaction.