Solid-state electrolytes (SSEs) have emerged as an important field of research and development for advanced battery technologies, with tremendous potential for applications across industries. The advantages of inorganic solid electrolytes (ISEs) include high mechanical strength, high safety, excellent chemical stability, and compatibility with high-energy-density electrodes. These properties enable ISEs to improve the performance and safety of batteries, offering great potential for the fabrication of high-performance solid-state batteries and attracting widespread research interest. This mini review highlights the potential applications of SSEs and recent advances in the types and preparation methods of ISEs, while also pointing out the opportunities and challenges facing ISEs. Further development of low-cost preparation methods, improved ion transport efficiency, and enhanced stability and safety of ISEs are needed to achieve continued progress in solid-state battery technology.