Steel rail nondestructive testing flaw detection device

The utility model discloses a steel rail nondestructive testing flaw detection device, which comprises a positioning shaft, a protection plate, a mounting rack, a first probe, a detection wheel, a second probe, lining plates and bushings, the symmetrically distributed lining plates are welded on the inner wall of the detection wheel, the bushings are mounted at the circle center positions of the lining plates, the positioning shaft is inserted in the bushings, and the protection plate is connected with the mounting rack. A positioning sleeve is mounted on the surface of the positioning shaft, a second probe is mounted on the lower surface of the positioning sleeve, protection plates are arranged on the two sides of the detection wheel, mounting frames are mounted on the inner walls of the lower ends of the protection plates, first probes are mounted on the inner walls of the lower ends of the mounting frames in an embedded mode, and a controller is mounted on the outer wall of one side of each protection plat