Cold-bending pipe bending machine for steel pipeline

The utility model provides a cold bending pipe bender for a steel pipeline, which comprises a tension bending unit, the tension bending unit comprises support plates which are oppositely arranged, the outer side surfaces of the support plates can be matched with the inner wall of a pipeline to be bent, and a telescopic tension mechanism is arranged between the support plates. In the stretching and retracting process of the telescopic tensioning mechanism, the supporting plate can be tightly attached to the inner wall of a to-be-bent pipeline or separated from the inner wall of the to-be-bent pipeline, a telescopic propelling mechanism is arranged on the side portion of the supporting plate, and the telescopic propelling mechanism can stretch out to apply thrust to the inner wall of the to-be-bent pipeline when the supporting plate is tightly attached to the inner wall of the to-be-bent pipeline. The tensioning and bending units can be connected in series to form a cylindrical assembly. According to the cold-b