The invention discloses a washing ball assembly. The washing ball assembly comprises a pair of washing balls, wherein each washing ball comprises a plurality of semicircular plastic pieces and a rotating shaft, the plurality of semicircular plastic pieces are rotationally arranged on the rotating shaft in a sleeving manner with the rotating shaft as an axis, an arc rubber strip is connected to an arc side of each plastic piece, a plurality of fine rubber strips are connected to the outer side surface of the rubber strip, each fine rubber strip is 3-5 cm long, a cylindrical inserting groove is formed in an end part of a rotating shaft section in one washing ball, a cylindrical inserting rod is arranged at an end part of a rotating shaft section in the other washing ball, a plurality of circular bulges are formed on the peripheral wall of the cylindrical inserting rod, a plurality of circular grooves are formed in the inner side wall of the cylindrical inserting groove, the cylindrical inserting rod is inserted into the cylindrical inserting groove, and the circular bulges are clamped in the circular grooves, so that the rotating shaft sections in the pair of washing balls can be rotationally connected. The washing ball assembly has good washing effect, and the use amount of washing powder or a laundry detergent is reduced by 5%.