The invention discloses a breakfast biscuit. The biscuit comprises the following raw materials in parts by weight: 225-350 parts of wheat flour, 65-85 parts of sugar powder, 8-20 parts of corn starch,25-50 parts of palm oil, 3-12 parts of maltose syrup, 10-30 parts of biscuit meal, 3-12 parts of ammonium bicarbonate, 0.5-2.5 parts of baking soda, 1.8-4 parts of salt, 0.15-0.7 part of cheese, 0.12-0.4 part of fresh milk, 0.1-0.25 part of sodium metabisulfite and 0.05-0.2 part of toughness enzyme. According to the invention, the cheese, the fresh milk and other nutrient ingredients are added into the biscuit through reasonable proportioning, so that the biscuit is good in mouth feel, and has increased nutritional components such as calcium, phosphorus and vitamins, and the nutritional structure of biscuits is improved, and the overall nutrients are more balanced. The invention also provides a preparation method of the breakfast biscuit.