A control method of a flocculation washing machine comprises: detecting an amount of washing water V and an amount of a detergent delivered m in a washing procedure to obtain a concentration of the detergent C = m / V; and determining a number of times N of flocculation circulation and a dose M n of a flocculant corresponding to each flocculation circulation according to the concentration of the detergent C. The number of times N of flocculation circulation and the dose M n of the flocculant corresponding to each flocculation circulation can be obtained accurately only based on one parameter. Besides, the flocculation treatment and the rinsing procedure of the washing machine are synchronously executed, and at an end node, the concentration of the detergent in the outer drum is lower than a set value, thereby achieving the purpose of removing detergent residual on clothes.
