Abstract: Sulfide-based all-solid-state lithium metal batteries enhance both energy density and safety by employing lithium metal anodes and non-flammable solid electrolytes, which are regarded as the ideal solution for next-generation energy storage and power battery applications. However, most sulfide-based solid electrolytes are unstable with lithium metal, prone to issues such as lithium dendrite growth, interface contact failure, poor cycling stability, and low coulombic efficiency during cycling. These problems severely hinder the commercial application of sulfide-based all-solid-state lithium metal batteries. This review provides a systematic overview of the key challenges at the interface between sulfide-based electrolytes and lithium metal anodes, offering a comprehensive summary of the latest research findings. Four primary improvement strategies are analyzed in depth: construction of artificial interface modification layer, development of lithium alloy anodes, design of three-dimensional anodes skeleton structure, and structural regulation of solid electrolytes. By thoroughly analyzing the shortcomings of existing interface modification strategies, and exploring future development directions through deepening multiphysics coupling mechanisms, constructing composite interface layers, innovating interface structure design, and AI-driven research, this review aims to provide theoretical foundations and design insights for developing highly safe, long-life all-solid-state lithium metal batteries.