A cooking device equipped in a food vending machine for cooking ingredients provided by the food vending machine has a chamber, a heating component, and a moving mechanism. The chamber extends in a straight line. The heating component and the moving mechanism are mounted in the chamber. The moving mechanism is used for moving the ingredients from the entrance to the exit. Thus, the cooking device can heat the raw ingredients until fully cooked, so the food vending machine can provide fresh and cooked-on-the-spot food. Furthermore, space in the chamber is utilized efficiently and the chamber suits for various ingredients and cooking methods. Besides, the moving mechanism is capable of moving multiple containers which contain ingredients, so the cooking device can heat multiple sets of ingredients at the same time.