The invention relates to a microwave oven and a control method thereof. The microwave oven comprises a control module and an operating panel which are arranged on a body, wherein the control module comprises a chip; the chip comprises a timer, a timer and a memory; and a clock display screen, a cooking finish time key, a cooking work time key and a clock adjusting key are arranged on the operating panel. The control method of the microwave oven comprises the following steps that: 1, the memory of the control module receives and stores information transmitted by the operating panel, a cooking finish time T2, a cooking work time t and the current clock T0; 2, the timer starts to time; 3, the timer performs comparative operation, and when the current T is equal to T2-t, the cooking starts automatically and the microwave oven starts to cook; and 4, when the time T of the timer is equal to T2, the cooking is finished. The invention has the characteristics of simple and rational structure, flexible operation and wide applicability.