The solid-state battery is crucial for achieving the next-generation batteries that possess high energy density, high safety, long service life, and low cost. Major countries and regions are rapidly advancing the research and industrial application of solid-state batteries. This study reviews the development status of key material systems for solid-state batteries worldwide from the aspects of technological, industrial, and supporting systems. It analyzes the technical development paths, industrial scales, and supporting systems of solid-state batteries in countries and regions including the United States, Europe, Japan, and Republic of Korea, and summarizes the development status and goals of the key material system for solid-state batteries in China. Our study reveals that the solid-state batteries are currently in a promotion stage in China, facing challenges in terms of key raw materials, breakthroughs in critical scientific and technological bottlenecks, mass production, and industrial application. To promote the development of solid-state batteries in China, we propose the following suggestions: (1) adhering to an overall staged-development strategy for solid-state batteries, (2) establishing national-level development programs and major scientific and technological projects for solid-state batteries, (3) promoting the construction of technology research and development institutions for solid-state batteries, (4) encouraging the market application and industrial transformation of solid-state batteries, and (5) optimizing the solid-state battery ecosystem.