This invention belongs to the field of train flaw detection technology, in particular to assembly tooling and method of flaw detection wheel of train tracks. The assembly tooling of flaw detection wheel of train tracks is used for assembling the flaw detection wheel in an installation groove. The flaw detection wheel is matched and hung in the guide groove and assembled into the installation groove. The invention also discloses an assembly method of the train track flaw detection wheel. The invention not only solves the posture problem of workers’ inability to exert force caused by lying supine to work, but the butting problem between the flaw detection wheel and the installation groove, it can avoid hand shaking caused by inability of the arm to exert force, which make it impossible to quickly push the flaw detection wheel into the installation groove. The invention can also solve the problems of locking and adjustment, and avoid the problem of bending and deformation of local supporting parts caused by long-time using, and it can greatly improve the convenience and adjustability of assembly, and make the invention more practical and more convenient to popularize and apply.

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