Washing machine and control method therefor

A washing machine, including:

• a water holding barrel;
• a circulation filtration pipeline, wherein, a water inlet end and a water outlet end of the circulation filtration pipeline are respectively connected with the water holding barrel;
• a filter device, arranged in the circulation filtration pipeline, and having a first water inlet, a filtered water outlet and a first sewage outlet;
• a sewage pipeline, being used for receiving sewage discharged from the first sewage outlet;
• a control valve assembly, arranged between the water inlet end of the circulation filtration pipeline and the filter device, wherein,
• the control valve assembly includes a valve body, and a first valve chamber and a second valve chamber that are independent from each other and are formed inside the valve body,
• the first valve chamber is provided with a second water inlet connected with the water holding barrel and a circulation water outlet connected with the first water inlet of the filter device, and the second valve chamber is provided with a second sewage outlet connected with the sewage pipeline and a sewage inlet connected with the first sewage outlet of the filter device;
• wherein,
• the valve body is provided with a switch mechanism,
• the switch mechanism is configured to, in a first working state, open the circulation water outlet and block the sewage inlet and/or the second sewage outlet, so the control valve assembly is connected with the water holding barrel and the first water inlet, and disconnected from the first sewage outlet and the sewage pipeline;
• the switch mechanism is configured to, in a second working state, block the circulation water outlet, and open the sewage inlet and the second sewage outlet, so the control valve assembly is disconnected from the water holding barrel and the first water inlet, and connected with the first sewage outlet and the sewage pipeline.