Wheel rim straightening machine for steel and aluminum wheel rims 10"-24”. A wheel rim is repaired by means of a hydraulic piston and special working end caps, which are a part of the machine equipment. Repair operations are easy and take not more than few minutes. Working end caps allow to fix a damaged wheel rim in any place of its deformation. The machine is also equipped with a rim positioning head, several centering rings, various end caps and sealing elements.