The invention provides a putting assembly, a clothes treatment device and a control method of the clothes treatment device. The putting assembly is used for the clothes treatment device. The clothes treatment device comprises a water inlet valve, and the water inlet valve is connected with the putting assembly. The putting assembly comprises a shell, a first accommodating cavity and a first partition plate. The shell is arranged to be a hollow first cavity, the first accommodating cavity is a first groove structure formed when the outer wall of one side of the shell is sunken, the first groovestructure is provided with a first water inlet and a first water outlet, the first water outlet is located above the first water inlet, the first partition plate is arranged in the shell, the first cavity is partitioned into a dissolving cavity by the first partition plate, and the dissolving cavity is communicated with the first water outlet. According to the putting assembly, the use level of adetergent is reduced while the cleanliness of clothes is guaranteed, the utilization rate of the detergent is increased, the occurrence of the situation that the high-concentration detergent is in direct contact with the clothes, and is left on the clothes is avoided, the damage to the clothes is reduced, fibers of the clothes are effectively protected, and the service life of the clothes is prolonged.