The invention discloses a method and
system for controlling on-off of a household electrical appliance and the household electrical appliance. The method for controlling the on-off of the household electrical appliance comprises the following steps: S1, acquiring a sound
signal on the household electrical appliance; S2, comparing the sound
signal with a set household electrical appliance knockingsound
signal to judge whether the household electrical appliance is knocked or not; and S3, if knock is judged, controlling the household electrical appliance to be turned on or turned off. The systemfor controlling the on-off of the household electrical appliance adopts the method for controlling the on-off of the household electrical appliance, and comprises a sound sensing module, an identification and judgment module and a control
processing module. The household electrical appliance comprises a household electrical appliance body and the
system for controlling the on-off of the householdelectrical appliance, and the
system for controlling the on-off of the household electrical appliance is arranged on the household electrical appliance body. When the method is implemented, when a
user needs to turn on or turn off the household electrical appliance, the household electrical appliance can be controlled to be turned on or turned off by directly knocking the household electrical appliance, and a specific button on a control panel or a remote controller does not need to be found to turn on or off. Therefore, the household electrical appliance is more convenient and faster to control, and the condition of mistaken touch is not easy to occur.