The invention relates to a distributor box of a washing machine and a water inlet method. The distributor box comprises a distributor box body and an upper cover of the distributor box, wherein the upper edge of the distributor box is provided with a slot, the slot and the distributor box body are integrally installed, an upper sealing cover is arranged above the slot and a plurality of water outlet structures communicated with the distributor box body are arranged on the upper sealing cover. The water can be entered on the distributor box body so as to dissolve washing powder thoroughly and prevent blocking; furthermore, the slot and the distributor box body are integrally arranged, therefore the distributor box is simple in structure; in addition, the water outlet structure is arranged on the upper sealing cover, therefore the distributor box is convenient to process, and the process can be realized simply; and a decorative cover plate arranged above the upper sealing cover can shield a water outlet structure, therefore a user can see smooth and beautiful upper end of the distributor box.