The utility model relates to a three-dimensional digital modeling system of a transformer substation. Including a measurement module, Remote control module, Processor, arrangement model server, Database server and display, the measuring module is in wireless connection with the remote control module; the remote control module is connected with the processor; Arrangement model servers are sequentially connected, the arrangement model server is connected with the database server; the display is connected with the arrangement model server; the measuring module comprises a laser emitting device and a laser reflecting device which are matched for use; wherein a laser ranging sensor is arranged on the laser transmitting device, a laser reflecting annular plate used for reflecting laser is arranged on the laser reflecting device, the laser ranging sensor and the laser reflecting annular plate are correspondingly arranged, and moving units are arranged at the bottoms of the laser transmittingdevice and the laser reflecting device. Compared with the prior art, the transformer substation three-dimensional modeling system can realize intelligent and efficient transformer substation three-dimensional modeling, and has the advantages of intuitiveness, accuracy, wide applicability and the like.