Safety device and multi-layer steel structure plant

The utility model relates to the technical field of building construction, and provides a safety device and a multi-layer steel structure plant. The safety device is applied to the multi-layer steel structure factory building, the multi-layer steel structure factory building comprises a plurality of steel beams, the steel beams are arranged in the horizontal direction and distributed at intervals in the width direction of the steel beams, and the safety device comprises at least one safety net and at least one connecting structure. A safety net is arranged between every two adjacent steel beams; the at least one connecting structure is connected with the safety net and the steel beams and used for connecting the safety net between the two adjacent steel beams. The safety net can be connected between every two adjacent steel beams through the connecting structures, and due to the fact that the space between every two adjacent steel beams is not empty, the safety net can catch falling constructors and objects,