A cooking device includes a base plate, a cooking plate mounted on and cooperating with the base plate to define a receiving space therebetween and formed with at least a drain hole in fluid communication with the receiving space, and a partition unit mounted on the base plate within the receiving space and dividing the receiving space into a warming compartment that is adapted to receive food therein so as to warm the food during cooking, and an oil compartment that is isolated from the warming compartment and that is adapted to receive oil, which is formed on the cooking plate as a result of cooking and which is drained through the drain hole in the cooking plate.