The invention discloses a medicament for treating hypoglycemia and a preparation method of the medicament. The medicmanet is mainly prepared from astragalus membranaceus, liquorice, fructus ziziphi jujubae, bighead atractylodes rhizome, ginseng, ginger, crystal sugar, radix ophiopogonis, sang, cochinchnese asparagus root, cornus officinalis, cortex cinnamomi, acorus calamus and the like according to a certain weight proportion. The medicament has the functions of promoting spleen yang, warming muscle, relieving restlessness and quenching thirst, and is high in effect taking effect and curing rate when used for treating the hypoglycemia without recurrence.