Prefabricated steel structure stair in box-type modular factory

The utility model discloses a box type modular factory prefabricated steel structure stair which comprises a supporting body, stair sections and a platform. The supporting body comprises a plurality of transverse supporting columns and a plurality of vertical supporting columns fixedly connected with the transverse supporting columns. The stair sections and the platform are arranged in interval space formed after the transverse supporting columns and the vertical supporting columns are connected, and the platform is located between the two continuous stair sections. The supporting main body isformed by the transverse supporting columns and the vertical supporting columns, the stair sections are erected in the supporting main body, and the platform is connected between every two continuousstair sections, so that the whole stair structure is formed, the structure is simple, assembling is convenient, assembling can be completed in the manufacturing field, and the manufacturing cost is reduced. And after being ma