Abstract: Provided are a control method, a control apparatus and a control device for a household appliance. The control method for a household appliance includes obtaining a user feature of a target user; determining a hardness of bathing water for the target user based on the user feature of the target user; and generating a control instruction for a water softener based on the hardness of the bathing water. The control method realizes automatic control over a water softener, improves the convenience of controlling the water softener, and determines the hardness of bathing water in combination with user features, thereby improving the accuracy of hardness determination, and improving the bathing experience of a user.