The invention relates to a method for utilizing the recycled water during the production process of aluminum hydroxide or aluminum oxide, which comprises the following steps: the recycled water produced from a mother liquor evaporating system is directly sent to a washing heater for heating, when the temperature of the recycled water reaches 95- 100 DEG C, the recycled water can be used for washing red mud. The utilization method of the recycled water has the advantages that: the pressure of a cooling tower is reduced, as the recycled water with a speed of approximately 60 m<3> need not be cooled down to 35-38 DEG C from 50-60 DEG C, but is instead directly conveyed to the washing heater for use; due to the new recycle water line, the pressure of a wastewater treatment system is eased, the wastewater can be treated in a timely manner and all enter the flow path, thus realizing zero discharge and avoiding environmental pollution; the consumption quantity of fresh water is accordingly reduced by avoiding the discharge of sewage; the alkali taken from a water cooler returns to the flow path and gradually enter the flow path, therefore, the alkali consumption is lowered and the cost is accordingly saved; due to the adequate utilization of the heat, the heating of recycled water in the washing heater is facilitated with sufficient heat, no new steam is necessary, thus economizing the use of heat energy and greatly reducing the labor intensity and danger of the working staff.