A
laundry treatment device and a control method therefor. The
laundry treatment device comprises a housing (1), a drum
assembly (2), a dispensing
assembly (3), and a Venturi tube (316). The dispensing
assembly (3) comprises a
water intake box (31), a detergent box (32) and a dispensing pump (33). The
water intake box (31) is arranged inside the housing (1). The detergent box (32) is arranged inside the
water intake box (31) in a drawable manner, and a
liquid storage cavity (320) is provided inside the detergent box (32). A constant-volume cavity (314) is provided inside the water intake box (31), and the dispensing pump (33) can draw a liquid from the
liquid storage cavity (320) into the constant-volume cavity (314). A premixing water path (315) is provided in the water intake box (31). One end of the premixing water path (315) is configured to connect a
water source, and the other end of the premixing water path (315) is configured to communicate with a washing cavity (20). The Venturi tube (316) is disposed in the premixing water path (315), and a negative pressure suction port of the Venturi tube (316) extends and is arranged in the constant-volume cavity (314). When water is fed into the premixing water path (315), the liquid and air in the constant-volume cavity (314) can be drawn by the negative pressure suction port of the Venturi tube (316) into the premixing water path (315) to mix with water in the premixing water path (315) and then dispensed into the washing cavity (20). By means of the premixing water path (315) in cooperation with the Venturi tube (316),
liquid laundry detergent and air are drawn from the constant-volume cavity (314) and are mixed with the
water flow in the premixing water path (315) to form a foam liquid, and the foam liquid is dispensed into the washing cavity (20), thereby improving the mixing degree of the dispensed
liquid laundry detergent and water.