Inclination detection device, household appliance and control method for household appliance

The invention relates to the technical field of inclination prevention, and discloses an inclination detection device. The inclination detection device comprises a box body; the liquid is contained in the box body, and a gap is reserved between the liquid and the top wall of the box body; the light emitting device is arranged on the box body; the light receiving device is arranged on the box body and is opposite to the light emitting device; when the box body is not inclined, one of the light emitting device and the light receiving device is located above the liquid level, and the other one of the light emitting device and the light receiving device is located below the liquid level. Light emitted by the light emitting device is received by the light receiving device after passing through the liquid and the air. When the box body is inclined, the height of the liquid level in the inclined direction changes, the proportion of the liquid through which the light passes to the air also changes, and therefore the