High voltage experiment training is an key part of the field of electrical engineering, but the traditional training is single, boring,expensive and dangerous. It easily leads to damage of equipment and even the life safety of trainers for experimental misoperations and accidents. In addition, the lack of experimental equipment causes that it is difficult to master there relative knowledge and technology. In view of these shortcomings, the high-voltage experimental training virtual simulation system is designed and developed based on virtual reality technology.The main research contents and innovative work of this paper are as follows: (1) By analyzing the problems of low training efficiency, less experimental equipment and high experimental risk in high voltage experiment training and the research status at home and abroad, the design scheme of high voltage experiment training project simulation system is given. (2) Through the combination of traditional 3D modeling technology and automatic 3D modeling technology, the 3D models of operating platform, insulation megger, protective ball gap and other equipment are constructed, the development process is optimized and the development efficiency is improved . (3) The optimized half folding algorithm is used to optimize the data volume of 3D model, which the optimization efficiency is improved and the smooth operation of the system is obtained. The technical content, visual mapping and light shadow generation are analyzed in detail. At the same time, the development of 3D simulation training function is completed by combining Adobe Premiere nonlinear editing technology, and the export process of 3D model . (4) Based on unity 3D virtual reality development engine and Visual Studio development platform, the system consists of the 3D scene roaming submodule, equipment wiring submodule,virtual operation submodule and the theoretical assessment submodule. The system has the characteristics of simple operation, rich content and strong sense of immersion, With the help of the system, employees can simulate the actual test process, which is helpful for mastering relevant technology, saving training cost, improving training effect.