The invention discloses a reinforcing
steel bar bending device for a building. The reinforcing
steel bar bending device comprises a bottom plate, a supporting plate, a supporting device, a cover plate device, a first pushing device, a second pushing device and a positioning device, wherein a first supporting block and a first roller are arranged on the bottom plate; a first supporting rod, a first cross rod and a second roller are arranged on the supporting plate; the supporting device comprises a second supporting rod, a third roller, a third supporting rod, a fourth roller, a fourth supporting rod, a fifth roller, a second cross rod, a first obliquity rod, a third cross rod and a first bent rod; the cover plate device comprises a first bracket, a second bracket, a fourth cross rod, a second vertical rod, a fifth cross rod, a third vertical rod, a fourth vertical rod, a sixth cross rod, a sixth roller and a cover plate; and the first pushing device comprises a first air cylinder, a first pushing rod, an eighth roller, a third bracket, a sixth vertical rod, a fifth supporting rod, a first guide block, a fourth bracket, a second bent rod and a fifth bracket. The reinforcing
steel bar bending device can be used for effectively bending a reinforcing steel bar.