The commonly used type of railway projection lighthouse tower is a four corner tower with equal width at the top and bottom. The current verification of lighthouses mostly shows that the stable stress of the main material exceeds the limit, while the stress of the horizontal and diagonal materials is relatively small. Therefore, in order to explore the optimization problem of railway floodlight tower structure design, two sets of model designs, four corner tower and three pipe tower, were carried out through software simulation. The effects of tower width, equal width, non main material specifications, and cross-sectional shape on the tower’s mechanical performance and steel consumption were analyzed. The results indicate that smaller changes in tower width have a smaller impact on the stress of the main material; compared to the same width lighthouse structure, the unequal width lighthouse structure significantly reduces the stress ratio of main and non main materials and uses less steel; reducing the specifications of non main components within a reasonable range is beneficial for reducing the stress ratio of main materials and tower top displacement, and can greatly save steel consumption; the stress, steel consumption, and occupied space of the three pipe tower structure are all better than those of the four corner tower.