Perovskite light-emitting diodes show great potential in the fields such as display, lighting, and imaging because of their high efficiency, high color purity, low fabrication cost, and widely tunable light emission spectra. Starting from the basic structure and working mechanism of perovskite light-emitting diodes, this review focuses on the main technical means to improve the fluorescence quantum yield, light extraction efficiency, carrier injection efficiency, and reliability of perovskite light-emitting diode devices. The development process of the key parameter improvement method for the blue, green, red, and near-infrared perovskite light-emitting diodes is systematically explained, and the latest research progress of lead-free perovskite light-emitting diodes is briefly introduced. The technology development trend of light-emitting diodes is discussed, and the methods and ideas to further improve the performance and reliability of perovskite light-emitting diodes are prospected.