The technology of one furnace with two working ends for float glass is significant for upgrading and transformation of float glass industry and achieving carbon peaking and carbon neutrality goals in China. In this study, a numerical simulation of a 1 250 t/d ultralargescale float glass furnace with two asymmetric working ends was carried out by using Glass Furnace Model software, and the temperature distribution and glass melt flow character were analyzed. The influence of an eccentric structure design for working ends on glass melt temperature homogeneity and glass melt flow stability at the exits was studied by analyzing temperature contour and melt flow pattern, and comparing trajectories of fastest particles, minimum residence time and average residence time of particles. The results show that the temperature of glass melt at the entrance of branch working ends decreases when the proportion of back flow feeding into the branch working ends increases. Increasing the length of channel connecting the neck and branch working ends leads a lower glass melt temperature at the branch line exit. It is clear that an appropriate eccentric structure design for working ends is beneficial for minimizing the difference of residence time in furnace between glass melt leaving through different working ends. It is also helpful for decreasing the temperature difference of glass melt in horizontal direction during homogenizing and cooling stages as well as increasing the flow stability of glass melt in both of the two working ends.