Low sugar triticale and purple sweet potato crisp biscuit and preparation method thereof

The invention discloses a low sugar triticale and purple sweet potato crisp biscuit and a preparation method thereof. The preparation method includes a burdening step which is performed by choosing constituents according to the following weight part ratio: 100 parts of low protein flour, 4-8 parts of triticale flour, 10-20 parts of purple sweet potato whole flour, 30-40 parts of lard oil, 8-12 parts of egg, 5-10 parts of drinking water, 0.10-0.20 part of glycyrrhizic acid tripotassium, 1-2 parts of baking powder, and 0.3-0.6 part of salt. The preparation method includes the following processing steps: 1) preparing emulsion; 2) concocting dough; 3) shaping; 4) baking. The crisp biscuit prepared by using the preparation method is low in sugar content, low in energy and high in nutrition value.