The utility model relates to the field of magnetic particle flaw detection equipment. The utility model relates to a flaw detector, in particular to a portable magnetic particle flaw detector. The flaw detector comprises a flaw detector main body and probe assemblies arranged on two sides of the lower end of the flaw detector main body, wherein the probe assembly comprises a metal shaping hose anda metal magnet yoke, one end of the metal shaping hose is connected with the flaw detector main body, the other end of the metal shaping hose is used for detachably mounting the metal magnet yoke, and the metal magnet yoke comprises a cylinder body with an inner hole and a plurality of probes telescopically arranged in the cylinder body; according to the portable magnetic particle flaw detector,the metal shaping hose is connected with the metal magnet yoke, and the bending angle of the metal shaping hose can be adjusted as required to adjust the detection angle of the metal magnet yoke, so that the applicability of the flaw detector is improved, the replacement of a probe assembly is avoided, the labor intensity of an operator is reduced, and the efficiency is improved.