The invention relates to the technical field of food processing, and particularly discloses a crispy biscuit and a making method thereof. Wheat flour, white granulated sugar, vegetable oil and water serve as main raw materials of the biscuit, and according to the making method, all the raw materials are firstly mixed into wet powder, and after extrusion forming is carried out through a double-screw extruding and puffing device, baking is carried out. On the one hand, compared with traditional dough, the wet powder has good liquidity, various die heads of a stereoscopic structure can be adopted for making the biscuit of a stereoscopic structure in an extruding mode, and the shape of the biscuit is enriched; on the other hand, the double-screw extruding and puffing device is adopted, the biscuit has a certain puffing rate in the extruding forming process and can be formed, the quantity of the adopted water, vegetable oil and swelling agent is greatly reduced, the phenomena that oil comes out of the biscuit, and the biscuit tastes hard are avoided, the made biscuit tastes crispy, and raw material cost is reduced.