The work aims to design a safe and reliable, suitable for a wide range of models, high structural strength, reusable, recyclable and stackable coiled cargo transport steel seat with retractable lateral stops, so as to solve the problems of coiled cargoes of lateral displacement in railway transportation, resulting in endanger the safety of railway transportation. First, according to the "Railway Cargo Loading and Reinforcement Rules", the various forces occurring in the coiled goods were calculated, and the loading and reinforcement plan was formulated; then, the materials and specifications of steel seat frame were determined according to the "Code for Design of Steel Structures" and the internal structure of the gondola and flat-collector. Then the three-dimensional modeling of the steel seat frame was carried out through SolidWorks, and the finite element analysis of the model was carried out by ANSYS. The result analysis showed that the steel seat frame was subject to vertical force and longitudinal force, the stress of the weakest part was 172.1 MPa and 244.39 MPa respectively, and the displacement and deformation were 0.23 mm and 0.19 mm respectively, which were all in line with the regulations; Under the action of unfavorable load, the shear stress of the tooth block was 7.11 MPa, the maximum equivalent stress of the transverse bar was 28.66 MPa, and the maximum deformation was 0.03 mm, which were all in compliance with the regulations. The railway coiled cargo lateral limit steel seat frame is safe and reliable, and can effectively prevent the lateral displacement of the coiled cargo, reduce the cost of loading and reinforcement, and play a great role in the development of the current coiled cargo transportation.