Tub of washing machine

The utility model relates to an inner washing tub of a washing machine. The outer side of the washing tub is provided with a plurality of casing covers, corresponding parts of the inner side of the washing tub are smooth and level, and a cavity formed by the connection of the casing covers and the washing tub forms a circulating water channel whose upper part is provided with a through hole which is communicated with the inner part of washing tub; hence, the inner wall of the washing tub is a corresponding complete overall structure, and the burr, the tilting, etc. defects in the washing tub can be reduced. The utility model keeps the spraying and jetting water flow or the similar water flow washing effect; the utility model can achieve the purposes that the inner side of the washing tub issmooth and level, and clothes can be prevent from scratching.