A double bottom girder structure of a container ship is disclosed. The double bottom girder structure of the container ship according to an embodiment of the present invention comprises girders which are vertically arranged between the inner bottom plate and the bottom shell plate of the container ship and allow multiple containers to be installed thereon at row intervals. The purpose of the present invention is to enable the construction of the lightened container ship and the loading of a large amount of the containers by reducing welding and plating processes and remarkably reducing the weight of the container ship.
