Additive engineering is extensively employed in perovskite light-emitting diodes (PeLEDs) to enhance the device performance. However, the effectiveness of additives is restricted, as they generally interact with only one or two components within the perovskite structure. Consequently, these additives are unable to fulfill the comprehensive functional requirements imposed by perovskite light-emitting materials. In this work, we successfully designed and synthesized a multifunctional additive of