The steel bar bending machine is an improvement on the structure of the steel bar bending machine. It uses a new type of reducer, large gear, small gear and bending disc surface. The feature lies in that in the structure, the bipolar braking motor is directly connected with the reducer as the first-stage reduction, the small gear and the large gear cooperate for the second-stage reduction, and the large gear always drives the bending disc surface to rotate. The central shaft hole and the bending shaft hole on the bending disc surface Several shaft holes are respectively provided on the positioning square bars of the worktable surface. The steel bars are bent bidirectionally by using the forward and reverse rotation of the motor.