Based on the intelligent construction of Qinglongsi coal preparation plant, and in response to the difficulty of centralized management of numerous intelligent control and management systems generated by intelligent construction, a 3-dimensional visualization twin system is studied and constructed to solve the problem. Firstly, 3-dimensional technology is used to construct a 3D scene, create equipment simulation and coal flow simulation. Secondly, based on the Unity3D engine, 3D twin development is carried out, combining process data with time as a variable and 3D models with space as a variable. This achieves full integration of intelligent systems and physical environments, multi business collaboration and linkage, comprehensive scheduling and early warning, and helps the efficient production and management of coal washing plants.