The invention discloses a rotary steel bar straightening machine and relates to the technical field of steel bar straightening machinery. The rotary steel bar straightening machine comprises a rotary straightening mechanism and a feeding mechanism, wherein the rotary straightening mechanism comprises a rotary cabin, a rotary seat is arranged in the rotary cabin, a plurality of clamping eaves are arranged on the rotary seat, a rotary cylinder is also arranged in the rotary cabin, a plurality of layers of inner cylinders which are concentric with the cylinder walls of outer cylinders are arranged in the rotary cylinder, the clamping eaves are clamped between the cylinder walls of the two adjacent inner cylinders, a plurality of annular pressing plates are arranged at the upper parts of the rotary cabin and are arranged between the cylinder walls of the two adjacent inner cylinders in sequence, and each annular pressing plate moves by means of an air cylinder; each of two push columns is a hollow column with openings in the two ends, a guide slope is arranged at the opening in the bottom end of each hollow column, and the opening in the top end is a discharging opening; the feeding mechanism is positioned at the upper part of the rotary cabin. The straightening machine has the benefits that by the utilization of the push function of rotating force, a disk-like steel bar passes through a narrow hollow pipe to finish the straightening work; the procedures are simple, and the straightening effect is good.