Large laser facility has many characteristics including complex structure, a large number of design and simulation models, and diversity of data. Design and simulation results are usually shown on different software platforms, and a unified integration platform for interactive data visualization is not formed. To solve these problems, we not only propose a three-dimensional (3D) visualization method for numerical simulation data of laser transmission based on 3D engine named Three.js and visualization library for numerical data named Vis.js, but also develop the corresponding software system. Firstly, the architecture of the 3D visualization system for numerical simulation data of laser transmission is presented. And then, the modules and key algorithms are designed and the implementation tools are given. Finally, the performance of the system is shown and summarized. The results show that the developed system can be used to visualize the designed transmission structure and simulation data of large laser facility. The visualization effect of optical path design of laser driver and transmitting simulation can be improved effectively.