The invention provides a microwave oven capable of fast operation and a control method thereof. The microwave oven comprises a control panel arranged on a microwave oven shell, a door body and a control device thereof, wherein the control device comprises a door switch monitoring whether a door is closed, a microcomputer controller, a microwave relay and a microwave high-voltage circuit; time input keys capable of setting time-defining signals as 1 to 10 minutes are arranged on the control panel; the input end and output end of the microcomputer controller are connected with the time input keys and the microwave relay respectively; and the door switch is connected to a primary coil of the microwave high-voltage circuit. Under the condition that the door switch is closed, any time input keyis pressed; the microcomputer controller controls the relay to close the time defined by the time input key; and the microwave high-voltage circuit obtains power work time defined by the time input key. After a time key is pressed, the time can be taken as set time to start the microwave oven. The invention has the advantages of speeding up time input and providing convenience for the operation of people.