In iron & steel combined enterprises, the resource utilization of electric precipitator dusts of sintering head rich in K and Na elements and waste desulfurization waste liquid of sintering flue rich in Cl^- is a difficult problem restricting the environmental protection of sintering process. The characteristics of the waste desulfate liquor and the electric precipitator dusts of the sintering head are studied, and it is found that the molar concentration of alkali metal elements in the electric precipitator dusts of the sintering head is 1.18 times that of Cl^- element, and the Na element is further introduced in the process of impurity removal in the leaching solution of the head ash, which further amplifies the problem of mismatch between the total amount of Cl^- and the content of alkali metals. The synergistic resource utilization technology of electric precipitator dusts and waste desulfate liquor of sintering head is proposed, and the leaching test of Cl^- rich waste desulfate liquor and the electric precipitator dusts of sintering head is carried out, and KCl and NaCl crystals are prepared by removing impurities, decolorizing and concentrating crystallization of leaching solution. The results show that the waste desulfate liquor and the electric precipitator dusts of the head are mixed and stirred at a ratio of 4:1, which can not only meet the balance needs of alkali metal ions and Cl^- in the leaching solution of electric precipitator dusts of the sintering head, but also replace the water for dissolving the ash of the head, so as to realize the environmental protection co-disposal and resource utilization of the sintering flue gas waste desulfate liquor and the electric precipitator dusts of sintering head. According to the scale of 4 million tons, the sintering machine can produce 600 tons of head ash per month, and the application of new technologies can produce 300 tons of KCl and 60 tons of NaCl per month, with a monthly economic benefit of about 447 000 yuan.