Digital sand table system based on three-dimensional visual environment

The invention is applicable to the field of digital sand tables, in particular to a digital sand table system based on a three-dimensional visual environment, which comprises a hardware layer and a digital sand table, the digital sand table comprises an equipment layer, a data layer, a service layer and a business layer, the business layer is used for providing a visual business function, and the business function comprises at least one of a design disclosure management module, a construction planning management module, a construction disclosure management module, a safety management module and a progress management module; the service layer is used for providing corresponding business services for the business functions; basic geographic information data, power transmission line engineering data and GIM three-dimensional model data are stored in the data layer; and the equipment layer is used for acquiring basic geographic information data in the power transmission line corridor channel and sending the basic