A laundry treating device, comprising: a water tub; a main water inlet pipe; a detergent box defining therein a detergent cavity configured to accommodate a detergent, and having a washing inlet (311, 313) connected to the main water inlet pipe and a washing outlet connected to the water tub; and a microbubble generator having a water inlet connected to the main water inlet pipe and a water outlet connected to the detergent box or the water tub, characterized in that: the microbubble generator is mounted to the detergent box, and the microbubble generator comprises an air dissolving tank and a cavitation element, the air dissolving tank defines an air dissolving cavity therein and has an inlet configured to feed water and an outlet configured to discharge water, the inlet is formed as the water inlet, or the inlet is in communication with the water inlet, the cavitation element is provided outside the air dissolving tank and connected to the outlet, or the cavitation element is provided at the outlet, and, the water outlet is formed at the cavitation element and in communication with the outlet, wherein the air dissolving tank further has an auxiliary port switched between a communication state and a non-communication state, and the auxiliary port is in communication with the air dissolving cavity when switched to the communication state. a water tub; a main water inlet pipe; a detergent box defining therein a detergent cavity configured to accommodate a detergent, and having a washing inlet (311, 313) connected to the main water inlet pipe and a washing outlet connected to the water tub; and a microbubble generator having a water inlet connected to the main water inlet pipe and a water outlet connected to the detergent box or the water tub, characterized in that: the microbubble generator is mounted to the detergent box, and the microbubble generator comprises an air dissolving tank and a cavitation element, the air dissolving tank defines an air dissolving cavity therein and has an inlet configured to feed water and an outlet configured to discharge water, the inlet is formed as the water inlet, or the inlet is in communication with the water inlet, the cavitation element is provided outside the air dissolving tank and connected to the outlet, or the cavitation element is provided at the outlet, and, the water outlet is formed at the cavitation element and in communication with the outlet, wherein the air dissolving tank further has an auxiliary port switched between a communication state and a non-communication state, and the auxiliary port is in communication with the air dissolving cavity when switched to the communication state. the microbubble generator is mounted to the detergent box, and the microbubble generator comprises an air dissolving tank and a cavitation element, the air dissolving tank defines an air dissolving cavity therein and has an inlet configured to feed water and an outlet configured to discharge water, the inlet is formed as the water inlet, or the inlet is in communication with the water inlet, the cavitation element is provided outside the air dissolving tank and connected to the outlet, or the cavitation element is provided at the outlet, and, the water outlet is formed at the cavitation element and in communication with the outlet, wherein the air dissolving tank further has an auxiliary port switched between a communication state and a non-communication state, and the auxiliary port is in communication with the air dissolving cavity when switched to the communication state.