Building steel structure construction locking device and method

The invention belongs to the field of steel structure construction, and provides a building steel structure construction locking device and method. The building steel structure construction locking device comprises a first connecting piece, a limiting piece, a fixing piece and a second connecting piece. The two first connecting pieces are oppositely arranged; at least two limiting pieces are installed between the two first connecting pieces in an annular array mode, and an insertion cavity where a steel structure part is inserted is formed between every two adjacent limiting pieces and the two first connecting pieces. The fixing piece penetrates through the two first connecting pieces and the limiting piece between the two first connecting pieces in the axial direction of the first connecting pieces. The second connecting piece is fixedly connected to the opposite sides of the two first connecting pieces. The steel beam can be fixedly connected at different angles, and the problems that the fixing angle of th