A straightener for a right-angled steel bar is used for straightening the steel bar with a right-angled bend, and comprises a base, a crossbeam, a fixed support, a swing rod, a movable sleeve, a movable support, a positioning assembly and a driving assembly, wherein the crossbeam is fixed with the top of the base, the strip-shaped hollow fixed support is arranged on the crossbeam, and the inner chamber of the fixed support is a fixed holding cavity used for fixing one end of the steel bar to be straightened; the swing rod is hinged to and mounted on the base and at one side of the crossbeam, the movable sleeve sleeves the swing rod, the hollow movable support is fixed on the outer wall, close to the crossbeam, of the movable sleeve, and the inner chamber of the movable support is a movable holding cavity used for holding the other end of the steel bar to be straightened; a fixed seat is arranged at the lower part of the swing rod, and the positioning assembly is arranged between the fixed seat and the swing rod; the driving assembly used for driving the swing rod to swing around the hinge point per se is arranged between the swing rod and the base. The straightener is convenient to operate and can realize quick straightening of the steel bar.