A laundry treating apparatus, comprising: a cabinet ; a water tub provided inside the cabinet ; a detergent box connected to the water tub to supply detergent to the water tub ; a main passage connected to the detergent box to supply wash water during main-wash; a main valve provided at the main passage ; a pre-passage connected to the detergent box to supply wash water during pre-wash; a pre-valve provided at the pre-passage ; and a controller configured to perform a first main-continuous supply process of continuously supplying the wash water by opening the main valve for a preset time, a pre-continuous supply process of continuously supplying the wash water by opening the pre-valve for a preset time, and a second main-continuous supply process of continuously supplying the wash water by opening the main valve , and configured to control each of the main valve and the pre-valve to supply the wash water to the detergent box through the first main-continuously supply process, the pre-continuous supply process, and the second main-continuous supply process, characterized in that the controller is configured to perform a main-intermittent supply process of intermittently opening and closing the main valve to intermittently supply the wash water of the main passage to the detergent box before the first main-continuous supply process, and the controller is configured to control the main valve in the main-intermittent supply process so that a process of opening the main valve for a main-intermittent opening time and closing the main valve for a main-intermittent closing time is repeated by a preset main-intermittent opening and closing frequency. a cabinet ; a water tub provided inside the cabinet ; a detergent box connected to the water tub to supply detergent to the water tub ; a main passage connected to the detergent box to supply wash water during main-wash; a main valve provided at the main passage ; a pre-passage connected to the detergent box to supply wash water during pre-wash; a pre-valve provided at the pre-passage ; and a controller configured to perform a first main-continuous supply process of continuously supplying the wash water by opening the main valve for a preset time, a pre-continuous supply process of continuously supplying the wash water by opening the pre-valve for a preset time, and a second main-continuous supply process of continuously supplying the wash water by opening the main valve , and configured to control each of the main valve and the pre-valve to supply the wash water to the detergent box through the first main-continuously supply process, the pre-continuous supply process, and the second main-continuous supply process, characterized in that the controller is configured to perform a main-intermittent supply process of intermittently opening and closing the main valve to intermittently supply the wash water of the main passage to the detergent box before the first main-continuous supply process, and the controller is configured to control the main valve in the main-intermittent supply process so that a process of opening the main valve for a main-intermittent opening time and closing the main valve for a main-intermittent closing time is repeated by a preset main-intermittent opening and closing frequency. <EOS>