Abstract: The transparent iron oxide yellow was prepared by using the yellow precipitates after separating arsenic and iron from the wastewater. The effects of pH value, stirring speed, reaction temperature and dose of surfactant on the transparency of iron oxide yellow were investigated. The results showed that when the pH value is 3.5, stirring speed 600r/min, reaction temperature 25°C and dose of surfactant 3%, the transparency of regularly prepared iron oxide yellow is 87% at 540nm. As a product, the iron oxide yellow made in such a way is in accordance with ISO1248-1974, thus realizing the waste recovery of iron from acidic arsenic-containing wastewater and its applications.