This paper proposes an agile model construction method based on meta-modeling theory to address issues such as low efficiency, poor cross-platform compatibility, and insufficient dynamic adaptability in military simulation model building in complex battlefield environments. The method utilizes a multi-domain integrated battlefield knowledge graph, a modular template library, and a dynamic verification mechanism to achieve rapid generation of heterogeneous simulation models, seamless integration across platforms, and enhanced system robustness. Case studies on typical scenarios, including counter-drone operations and joint air defense, validate the advantages of the method in cross-service coordination, environmental disturbance response, and tactical model adaptability. The study demonstrates that this method significantly improves the efficiency of building complex battlefield simulation systems and enhances real-time responsiveness, especially for modern joint operations and multi-platform collaborative simulations. By combining theory and practical applications, this paper provides an effective technical pathway and theoretical support for building adaptive, cross-platform compatible military simulation systems.