The invention relates to a method for extracting valuable metal in zinc concentrate oxidizing slag through chlorine-containing waste water. The method comprises the steps that fine grinding, screening, stirring and pelleting are sequentially conducted, so that pellets are obtained; pre-drying and high-temperature roasting are conducted, so that high temperature flue gas (13) containing the valuable metal and roasting slag are obtained; stirring is conducted, so that reducing roasting slag is obtained; heat preservation is conducted, so that heat preservation materials and heat preservation flue gas are obtained; crushing and fine grinding are conducted, so that heat preservation materials which are ground to be fine are obtained; magnetic separation is conducted, so that product magnetiteconcentrate and silicon-aluminum-calcium residues are obtained; drip washing and collection are conducted, so that washing liquid containing the valuable metal is obtained; heating for concentration is conducted, so that washing liquid with hydrogen chloride gas removed is obtained; and segmented recycling is conducted, so that an iron-containing product, a copper-containing product, a cobalt-nickel product and filter liquor are obtained. By means of the method, valuable metal elements, such as iron, zinc, copper, cobalt and nickel, in the pressure oxidizing waste slag can be recycled, and thedisposal cost of the chlorine-containing waste water which is difficult to dispose is lowered. The method has the advantages that the potential heavy metal pollution risk of the oxidizing waste slagis low; the acid consumption is low; the cost is low; the recycling rate is high; the technological flow is short; the equipment investment is low; and the maintenance cost is low. The method is applicable to comprehensive recycling and application of the non-ferrous metallurgy solid waste slag.