The invention relates to a floor bearing plate of a steel structure prefab house. The floor bearing plate comprises a plate body, hook-shaped connecting bodies are arranged on the left side and the right side of the plate body correspondingly, and two triangular reinforcing ribs are evenly arranged in the middle of the plate body in a spaced mode. On the one hand, by arranging the triangular reinforcing rib structures, the bearing strength of the floor bearing plate is improved greatly; and on the other hand, by arranging the hook-shaped connecting bodies, different floor bearing plates are inmutual lapping connection more flexibly, more conveniently and more firmly, and the floor bearing plate is mainly applied to the field of manufacturing of the steel structure prefab houses.