The utility model discloses a concave edge supporting bracket with a hook piece, in particular relating to the technical field of building materials. A hanging plate, an internal folding plate, a supporting plate and a concave edge are integrated, and the hook piece, a mortise lug, a mortise plate and a block are integrated. The hanging plate is equipped with a fixing hole, the internal plate is equipped with a mortise hole, the concave edge is equipped with a hook hole, the hanging plate and an arc plate are in rivet joint, the mortise lug at one end of the hook piece and the mortise hole of the internal folding plate are in plug-in mounting, the mortise plate at the other end of the hook piece and the hook hole of the concave edge are in plug-in mounting, simultaneously, the block at the inner side of the mortise plate passes through the hook and is interlocked with the concave edge. The horizontal plate, the supporting plate, the arc plate and the hook piece of the ranging plate are all equipped with reinforcing ribs. The surface of the utility model has an anti-rust color-coated layer. The concave edge supporting bracket is used to support water-falling shuting of buildings, which is stable in fixing of the water-falling shuting of buildings and long in service life.