This article presents the development of perovskite light-emitting diodes (LEDs) based on solution-processed self-organized multiple quantum wells (MQWs). The MQW-based LEDs exhibit high external quantum efficiency (EQE) of up to 11.7%, good stability, and exceptional high-power performance with an energy conversion efficiency of 5.5% at a current density of 100 mA cm\(^{-2}\). The MQW structure effectively confines lower bandgap regions that generate electroluminescence, leading to efficient radiative decay. The MQW films have a smooth and uniform morphology, with a root-mean-square roughness of 2.6 nm, comparable to 2D perovskite films. The MQW LEDs demonstrate high radiance and low turn-on voltages, and their performance is further enhanced by tuning the halide compositions in the precursor solutions. The devices also show good color tunability and stability, with a stability improvement by two orders of magnitude compared to 3D perovskite LEDs. This work highlights the potential of perovskite MQWs for high-performance optoelectronic applications.This article presents the development of perovskite light-emitting diodes (LEDs) based on solution-processed self-organized multiple quantum wells (MQWs). The MQW-based LEDs exhibit high external quantum efficiency (EQE) of up to 11.7%, good stability, and exceptional high-power performance with an energy conversion efficiency of 5.5% at a current density of 100 mA cm\(^{-2}\). The MQW structure effectively confines lower bandgap regions that generate electroluminescence, leading to efficient radiative decay. The MQW films have a smooth and uniform morphology, with a root-mean-square roughness of 2.6 nm, comparable to 2D perovskite films. The MQW LEDs demonstrate high radiance and low turn-on voltages, and their performance is further enhanced by tuning the halide compositions in the precursor solutions. The devices also show good color tunability and stability, with a stability improvement by two orders of magnitude compared to 3D perovskite LEDs. This work highlights the potential of perovskite MQWs for high-performance optoelectronic applications.