To intuitively analyze the variation of tritium diffusion data in the tritium safety containment system and realize the three-dimensional visualization of the calculated tritium diffusion data in space, this study developes a three-dimensional virtual simulation system for tritium safety containment based on a Unity3D engine. This system carries out a three-dimensional simulation of the tritium transport, leakage, and diffusion process with a particle system driven by calculated data. The tritium transport, leakage, and diffusion process in the tokamak exhaust processing (TEP) system is simulated, with the TEP system of the China Fusion Engineering Testing Reactor (CFETR) as an example. Visual analysis is carried out on key positions of infiltration and leakage, verifying the security of the tritium safety containment system. This study serves as a reference for future research in tritium safety containment systems and tritium infiltration and leakage.