A service-oriented extendable combination simulation engine comprises a simulation engine frame, a manager interface, a service interface, a plurality of manager implementations and service implementations with different functions. The simulation engine frame is used for creating and maintaining the manager implementations and the service implementations, a simulation model calls the manager interface and the service interface through the simulation engine frame, so that the manager implementations and the service implementations are accessed, the simulation engine frame integrates the manager interface and the service interface by the aid of a bus mode, and manger and service function interfaces and function implementations are mapped in a interface bridging manner. According to the simulation engine, extendibility and combination of the simulation engine frame are improved, the simulation engine frame can flexibly distribute function modules of the simulation engine according to different simulation system requirements, the function modules are dynamically combined to form the simulation engine meeting the requirements, reusability of the simulation engine frame is achieved, and applicability and stability of the simulation engine are improved.