The invention provides a steel partition. The steel partition is characterized by comprising a bottom groove, a panel support part, partition unit plates, a positioning pin, a frame, a pressing bar and a top groove, wherein the cross section of the bottom groove is U-shaped; two top sides are arranged on the upper end of the bottom groove; the panel support part sleeves the top sides of the upper end of the bottom groove through a groove opening and is mounted above the bottom groove; the partition unit plates are oppositely arranged in a matrix manner to form two wall surfaces; the frame is arranged between the two wall surfaces formed by matrixes of the partition unit plates; the positioning pin is arranged between an upper partition unit plate and a lower partition unit plate; the positioning pin is arranged by passing through positioning holes of the partition unit plates; the pressing bar is fixedly connected to the frame through tapping screws; the cross section of the pressing bar is U-shaped; two top sides of the pressing bar are embedded in U-shaped grooves of two adjacent partition unit plates; the cross section of the top groove is n-shaped; the top groove is formed in the top. The steel partition is convenient and free to mount and demount and is good in integrity.