The utility model discloses a construction steel bar bending device, which comprises a frame, carriage and rack, the carriage sets up between frame and rack, spaced mount pad about being provided within the frame, rotatable pinch roller and the drive wheel of being provided with between two mount pads, the wheel face of pinch roller sets up with the wheel face relative up -down of drive wheel, form the transmission path who supplies the reinforcing bar to pass between the two, be provided with in the frame and be used for making the pinch roller to be close to or to keep away from the actuating mechanism of drive wheel, the interval is provided with a plurality of positioning mechanism on the carriage, every positioning mechanism corresponds the locating plate that sets up on the carriageincluding controlling, form the location space between two locating plates, the rotatable carousel that is provided with on the rack, the outside extension in bottom of carousel is provided with theconnecting plate, connecting plate upwards extension is provided with the baffle, be formed with the space of bending that supplies the reinforcing bar to penetrate between baffle and the carousel, the advantage is machining efficiency height, ability automatic feeding and convenient operation.