The invention relates to low- glycemic-index biscuits and a making method thereof. The making method comprises the following steps: taking raw materials in parts by weight, mixing table salt with konjaku flour and inulin, and adding water for stirring so as to obtain a mixture A; heating anhydrous butter until the anhydrous butter is melted, performing rapid stirring to get foam, adding eggs, and continuing to quickly get foam so as to obtain a mixture B; adding water to ammonium bicarbonate and sodium bicarbonate for stirring and dissolving so as to obtain a mixture C; uniformly mixing flour with maltitol, xylitol, defatted soy flour, tartarian buckwheat powder, wheat dietary fibers, green bean powder, scindapsus aureus, resistant dextrin, buckwheat, nonfat dry milk powder and celery powder, enabling the prepared mixture A, the mixture B and the mixture C to be concocted into dough by a dough mixer, and performing refrigeration standing; pressing the dough into sheets with a noodle press, so as to obtain shaped biscuit blanks; and putting the biscuit blanks in an oven, performing baking under 180 DEG C for 10min, then performing cooling, and performing packaging so as to obtain the low- glycemic-index biscuits. The GI value of the made biscuits made by the method disclosed by the invention is 41.8 or below, so that the made biscuits are really suitable for diabetics to eat.