Abstract: Copper smelting waste acid contains valuable metals such as copper and arsenic, but traditional treatment methods suffer from low recovery rates and secondary pollution issues. This paper aims to develop a novel valuable metal selective recovery reagent to achieve efficient copper recovery and resource utilization of copper smelting waste acid. Through experiments, a composite reagent with pyrrole as a targeting agent and sodium sulfide as a precipitant is identified as the optimal formulation. The addition ratio and preparation method are also optimized. The results show that the novel reagent exhibits significant selective recovery of copper ions from copper smelting waste acid, with a recovery rate of up to 99.2%. The quality of the copper slag produced by the reagent treatment meets the standards of copper concentrate. This research provides a new approach and method for the resource utilization of copper smelting waste acid.