A flocculation washing machine comprises an outer barrel, a washing structure disposed inside the outer barrel and a circulating water treatment device disposed outside the outer barrel. The circulating water treatment device comprises a flocculation treatment unit for performing flocculation treatment on washing water; the flocculation treatment unit is communicated with the outer barrel through a filtering device, so that flocculation water after filtering treatment flows back to the outer barrel. And an overflow port is formed in the filtering device, and a flow sensor for detecting an overflow rate is arranged at the overflow port. A control method of the flocculation washing machine comprises: an overflow rate of the filtering device and/or a liquid level height in a flocculation container are detected in real time, and a blockage state of the filtering device is judged according to a relationship between a detection value and a preset value. The blockage state of the filtering device is determined by ju
