The invention discloses a sodium-sulfur cell module which comprises a cell module box and sub-cell modules arranged inside the cell module box. The cell module box comprises a box body and a box door which can close the front end of the box body. Each sub-cell module comprises a heat insulation and preservation box body, sodium-sulfur cell monomers arranged inside the heat insulation and preservation box body in a matrix arrangement mode, and a heat insulation and preservation box cover for closing the top face of the heat insulation and preservation box body. Any two adjacent sub-cell modules in the cell module box are partitioned through a fire-proof mica plate. The sodium-sulfur cell module has the technical effects that the sodium-sulfur cell module can be directly used outdoors, and due to the fact that only the sub-cell module where the damaged sodium-sulfur cell monomer is located needs to be replaced during maintenance, maintenance is easier and more convenient, and the maintenance cost is greatly lowered.