Abstract: Military combat is characterized by suddenness, high dynamics, and strong destructiveness. The digital simulation of combat processes is a key enabling technology for winning modern wars. With the rapid development of new-generation information and communication technologies, the accelerated advancement of digitalization, networking, and intelligent upgrading has provided strong support for the research on digital simulation technologies of military operations. Based on this, a combat simulation platform based on reconfigurable digital twin was proposed, which integrates digital twin technology and visual simulation technology to realize high-fidelity simulation and deduction of military operations. In response to the diversity of combat scenarios, the dynamics of combat processes, and the high variability of combat conditions, a reconfigurable digital twin base technology was proposed. On this basis, a combat simulation platform architecture integrating scenario reconfigurability, model reconfigurability and mapping reconfigurability was designed. Furthermore, the methods for rapid configuration of combat scenarios and combat simulation were studied, and a digital twin environment, combat simulation engine and process oriented to military operations were established. Finally, the effectiveness and applicability of the proposed combat simulation platform were verified through simulation of four typical military combat scenarios, namely land, sea, air and system confrontation.