The invention relates to a data real-time three-dimensional visual system of a power grid. The system is characterized by comprising four sub-systems, namely a voltage information sub-system, a reactive margin information sub-system, a tidal information sub-system and a stable information sub-system, wherein the voltage information sub-system supports picture switching between a three-dimensional surface chart and a three-dimensional cylindrical chart, represents a voltage of each node in a main grid frame by a cylinder under the three-dimensional cylindrical chart, and represents the voltage by using different colours and heights, so relative voltage among different nodes can be intuitively expressed, and the three-dimensional surface chart and the three-dimensional cylindrical chart can vary along with the real-time data refreshing of the power grid. By the invention, data in the power grid can be expressed quickly, efficiently and intuitively, so that a dispatcher can quickly know whether a problem exists in the current system and know the severity of the problem, and the dispatcher can know the running situation of the power grid wholly and macroscopically.