Virtual simulation technology is a hot topic in computer science research currently, and applying it to trenchless pipe laying is the development trend of teaching and research. Since HDD is the main construction method of trenchless technology, SolidWorks, 3ds MAX, Photoshop and other software were used to set up a 3D model for the 3D working scenario, drill rigs, drill bits, etc. The training system was developed on the Unity 3D platform by researching scene roaming technology, multi-camera following technology, physical effect simulation technology, track record and follow-up technology etc. and the system was released to the desktop system. The system includes scene roaming, multi-view display, control drilling and display parameter. The test results show that the training system runs smoothly, the scene switches quickly, and has a good 3D display and teaching functions.