The invention discloses a sodium-sulfur battery module, belonging to the field of chemical energy storage. The sodium-sulfur battery module comprises a heat-insulation box defined by a bottom plate, two side plates, two end plates and a box cover, wherein the heat-insulation box is divided into four heat-insulation chambers by a long heat insulation plate and a short heat insulation plate; the bottom plate is provided with counter bores which are arrayed in a matrix; each counter bore is provided with a protective casing; each protective casing is internally provided with a single sodium-sulfur battery; the sodium-sulfur batteries in all the heat-insulation chambers are connected to form a sodium-sulfur battery unit; each heat-insulation chamber uses a bottom heating plate and an exclusive side heating plate; a public side heating plate is shared by the adjacent two heat-insulation chambers along the short heat insulation plate; an end plate heating plate is shared by the adjacent two heat-insulation chambers along the long heat insulation plate; twelve heating plates with temperature control circuits are arranged and temperature measuring thermocouples are arranged at the peripheries of the twelve heating plates; the temperature control circuits and the temperature measuring thermocouples are connected with a BMS (Battery Management System); a maximum thermocouple is arranged on the edge of the top face of the bottom plate and a minimum thermocouple is arranged at the crossed point of the top edges of the long heat insulation plate and the short heat insulation plate; the maximum thermocouple and the minimum thermocouple are connected with the BMS.