The invention provides a shear wave oblique probe reflected/diffracted/deformed wave detection method. When an ultrasonic shear wave is propagated and encounters a flaw, reflected, diffracted, and deformed waves are generated; comprehensive analysis is performed on these waves, and it is determined, according to reflection features of the reflected waves and diffraction features of the diffracted waves, whether a flaw exists; the shape and size of the flaw is obtained according to a deformed surface wave generated at a flaw end point; by combining propagation paths of the deformed surface wave, the deformed shear wave, the deformed longitudinal wave and the transmitted shear wave generated by the flaw, the causes of all the waves displayed on a screen are revealed, so as to determine a basis for determining an angle or direction of a flaw, thereby accurately positioning flaws, performing quantitative and qualitative analysis, and displaying in three dimensions the actual flaw shape by using A-scan ultrasonic techniques.
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