The utility model discloses a bending device for rebars that construction was used, comprises a workbench, the table leg board is all installed at the bottom both ends of workstation, first motor is installed to the side of table leg board, install the gear on the output shaft of first motor, the fixed block is installed at the top of workstation, the fixed block is the cylinder structure, and thetop border of fixed block is equipped with the calibration loop, and two sets of thread grooves have been seted up at the top of fixed block, all install the screw rod in two sets of thread grooves,and cylindric locating part is all installed on the top of two screw rods, and the carousel has been cup jointed to outside rotation of fixed block, the external fixation of carousel has cup jointed the ring gear, ring gear and gear meshing transmission, clamping device is installed at the top of carousel, clamping device includes bottom plate, slider, pneumatic cylinder, starting stave, first clamp splice, second riser, second clamp splice and roof. The utility model discloses it is very convenient to operate, uses in a flexible way, and simple structure has fine novelty and practicality.