The invention discloses a rotary reinforcing steel bar straightener and relates to the technical field of reinforcing steel bar straighteners. The rotary reinforcing steel bar straightener comprises a rotary straightening mechanism and a feeding mechanism, wherein the rotary straightening mechanism comprises a rotary cabin. A rotary base is arranged in the rotary cabin, a plurality of locking eaves are arranged on the rotary base, and a swirling drum is further arranged in the rotary cabin. The swirling drum comprises a plurality of layers of inner cylinders which are concentrically arranged with an outer cylinder wall; the locking eaves are clamped between the cylinder walls of adjacent two inner cylinders, a plurality of annular pressing plates are arranged in the upper part of the rotary cabin, the annular pressing plates are successively arranged between the cylinder walls of adjacent two inner cylinders, each annular pressing plate moves by means of an air cylinder, one of the ejector rods is a hollow pile which is opened at two ends, a guiding slope is arranged at the opening of the bottom end of the hollow pile, the opening of the top end is a discharge hole, and the feeding mechanism is positioned in the upper part of the rotary cabin. According to the straightener, by virtue of an ejecting action of a rotary force, a discal reinforcing steel bar passes through a narrow hollow pipe to be straightened, and the step is simple and the straightening effect is good.