To solve the costly, time-consuming and unscalable problem of previous substation 3D simulation system, a new 3D visual component assembly technology of smart substation simulation is put forward. The visual component includes the 3D model of the smart substation’s equipment, and the realization of the equipment’s logic function and IEC61850 communication module’s simulation. With the assembly of visual component, the 3D design of a smart substation can be accelerated. In addition, the whole substation’s debugging and simulation can be completed by connecting and configurating visual component’s underlying modules. Experiment reveals that this technology can not only accelerate the development of the new generation of smart substation 3D simulation system, but also provide the visual simulation training of the substation’s underlying IEC61850 information flow for the operations staff. This work is supported by National Natural Science Foundation of China (No. 51377122).