The invention belongs to the field of pet food, and in particular relates to a pet biscuit and a preparation method thereof. According to the pet biscuit and the preparation method thereof, a skin material and a core material are respectively molded by using a machine, and the biscuit is prepared by molding next, thereby improving the production efficiency. The product appearance is novel, so the entertaining quality and palatability are increased for pets in eating. The pet biscuit provided by the invention is a low-temperature baked food, nutrient substances in the food are reserved to a great extent, so the food is fresher and provides abundant necessary nutrition for pets; and simultaneously, the water content during baking is controlled below 8%, the water activity is lower, so the pet biscuit is not easy to rot and deteriorate and is favorable for long-term storage.