This system takes VR and AR technology as a bridge, breaking the boundary between "virtual" and "reality". It not only provides a "more intuitive, more efficient and more intelligent" solution for engine assembly, but also is expected to become a typical paradigm for digital transformation in the field of high-end equipment manufacturing, making virtual reality and augmented reality technology the core force for reconstructing industrial assembly mode. The system builds a high-precision digital twin model of the engine (as shown in the "component deployment" effect in the figure, which can clearly present the form, interface and assembly logic of each component). Users can completely "immerse" in the virtual assembly space through the VR device, and are free to "disassemble-assemble" the engine repeatedly. AR technology achieves "precise superposition of virtual information and real scenes". Operators in the real assembly site, with the help of AR glasses and other equipment, can see the virtual engine components "suspended" in the real space, so that the physical world and digital information seamless connection, equivalent to the workers equipped with "visual intelligent assembly assistant".