Abstract: Halide perovskite exhibits exceptional optical properties, including robust light absorption, high carrier mobility, elevated fluorescence quantum yield, prolonged carrier lifetime, remarkable photoelectric conversion coefficient, and adjustable band gap. These attributes render it highly promising for diverse applications in light-emitting diodes, solar cells, detection sensors, anti-counterfeiting and other fields. However, the susceptibility of halide perovskite to external factors such as temperature, humidity, and light compromises its stability. It causes decomposition, crystal structure change, phase transition, etc., which leads to the weakening of its optical properties and limits its application. Consequently, enhancing the stability of halide perovskite remains a crucial avenue of research. This article begins by introducing the structure of halide perovskite and analyzing the external factors that impact its stability. Then, it provides an overview of recent advancements in improving the stability of halide perovskite through polymeric ligand modification (natural polymers and synthetic polymers). Finally, it outlines existing challenges in current research on halide perovskite nanomaterials while also offering insights into future research directions.