The leakage of microwave oven is caused by liquid infiltration and aging of insulating materials. Brand: Midea microwave oven, model: PC2021W. There are three reasons for leakage: 1, water, drinks and other liquids penetrate into the wire interface, resulting in leakage. Solution: Wipe water, drinks and other liquids clean, and then blow dry with a hair dryer. 2. The aging of the insulation material on the surface of the microwave oven leads to direct contact inside and outside, which leads to electric leakage. Solution: Replace the aging parts or install new insulators where the insulating materials are located. 3. The wiring is wrong. The correct wiring method is to connect the zero line on the left and the live line on the right.