This paper focuses to build a completely immersive campus roaming system with taking Shanghai Technician School as the object of 3D virtual roaming system by using 3Ds Max and Quest 3D platform as development tools, combining WebGL and threes.js library programming language, and integrating with HTML5 pages. The technology of camera creation, lighting setting and trifold screen release of VR scene in the integrated development stage of the system are studied, and the complete scheme of virtual simulation roaming system based on the fully immersive case of campus is proposed and implemented, which provides a reference for the application of the fully immersive virtual simulation roaming system.