The utility model relates to a supporting device in a heating furnace and belongs to the technical field of steel rolling heating furnace equipment in the metallurgical industry. According to the technical scheme, a solid wall (3) is arranged at the bottom of a low-temperature preheating section, a precast block with a rail groove is placed in the middle of the solid wall (3), and rail bricks areplaced at the top of the solid wall (3); 180-degree supporting arches (5) are arranged at the positions, corresponding to the lower burners, of the lower portion of the high-temperature heating section, the tops of the supporting arches (5) are leveled with precast blocks in the low-temperature preheating section through high-alumina bricks, and rail bricks are placed at the tops of the supportingarches (5). A hollow wall (4) is arranged on the lower portion of the high-temperature soaking section, a precast block with a track groove is placed in the middle of the hollow wall (4), and a trackbrick is placed at the top of the hollow wall (4). The utility model has the benefits that the problem that the two ends of the bearing steel billet droop at high temperature is solved, and the qualification rate of the bearing steel with the liquation of less than or equal to the first grade reaches more than 90%.