In order to analyze the temperature rise of the heating module for sodium-sulfur battery, the theoretical model of the heating module and fitting model of the experimental temperature data were established on the basis of 3D transient heat conduction equation and Weibull function, respectively, and also the temperature rise process and the transient temperature distribution of heating module for sodium-sulfur battery were numerically simulated, and the effects of Weibull parameters on the temperature rise curve were further investigated. The results indicate that the Weibull fitting model could accurately describe the temperature rise process of heating module with high reliability, and the temperature rise rate inside the whole heating module presents nonlinearly decreasing trend with the increase of time, as well as the length from the module center. Furthermore, shape and scale parameter dominate the efficiency of the sectional temperature rise and the overall one respectively, and the technical reference is provided for the optimal design of heating module for sodium-sulfur battery and other heating devices.