Flaw detector

The invention discloses a flaw detector, which comprises a main body structure, four groups of walking mechanisms and a flaw detection mechanism, the main body structure comprises a bottom plate, a bottom shell, a storage battery, a controller, a holder camera and a plurality of radar sensors, and each walking mechanism comprises a vertical plate, a connecting shaft, a walking wheel and a motor. The flaw detector has a navigation function, can avoid the accident phenomenon of collision in the walking process, ensures that the flaw detection machine can walk stably and safely, can automatically move to a target area according to an issued task instruction during use, is relatively high in intelligent degree and very convenient to use, brings great convenience to the work of workers. The flaw detector can adapt to flaw detection of workpieces with different volume specifications, is good in applicability, can prevent X-rays generated by the ceramic ray tube from hurting workers under the action of the anti-radi