The invention discloses a washing machine and a control method thereof. The washing machine comprises an outer cylinder, an inner cylinder, a driving motor, a heating mechanism, a control circuit, a control panel and a water hydrogen machine; the outer cylinder is provided with a water inlet and a water outlet, and the inner cylinder is arranged inside the outer cylinder; the driving motor is connected to the inner cylinder for driving the inner cylinder to rotate; the water hydrogen machine comprises a methanol water reforming hydrogen production device, a hydrogen fuel battery and a gas pump; the methanol water reforming hydrogen production device is provided with a first high temperature exhaust gas discharge pipeline and a second high temperature exhaust gas discharge pipeline; the heating mechanism comprises a high temperature exhaust gas heating mechanism; the high temperature exhaust gas heating pipeline is connected to the second high temperature exhaust gas discharge pipeline,and the high temperature exhaust gas output by the methanol water reforming hydrogen production device can be used for heating water in the outer cylinder. The washing machine can be carried at any time according to needs, can be used outdoors, and be free from the constraints on a power grid and a water source. In addition, the heat energy released by the water hydrogen machine can be used for heating the washing machine to further save energy.