The invention relates to a method for producing stable chlorine dioxides through the double reduction method, which is characterized in that: sulfur dioxide and oxydol are utilized to be reducing agents; sodium chlorate acid solution is oxidized at a temperature of between 30 and 70 DEG C to generate gaseous chlorine dioxide; and sodium carbonate and oxydol are used for absorbing the gaseous chlorine dioxide to generate the stable chlorine dioxide. The method has the main technical characteristics that: by adoption of the sulfur dioxide and the oxydol as the reducing agents simultaneously, the purity of products and the conversion rate of raw materials are improved; the conversion rate of sodium chlorate is as high as over 98 percent and the purity of the gaseous chlorine dioxide generated is as high as over 99 percent; the use level of sulphuric acid is reduced; and the processing capacity of waste acid in the subsequent technique is reduced. The technique is balanced in operation, is easy to control and reduces the risk during the production process.