In order to simplify the virtual simulation of aircraft power system maintenance, a virtual maintenance process modeling method based on system modeling language (SysML) is proposed by introducing the object-oriented structured design idea. All the information required by this method comes from the functional requirements analysis of airborne system maintenance simulation. Firstly, the functional requirements of the dynamic behavior of aircraft power system maintenance are analyzed, the modular structure is established, and the simulation elements are extracted. Secondly, based on the SysML state machine model, a model based on system control characteristics is established, and the key properties of the state diagram are analyzed to verify the feasibility. Finally, the aircraft battery assembly is taken as an example to show the modeling and simulation of the proposed method, and the effectiveness of the model is verified.