The invention relates to a magnetic characteristic detecting device for saturated reactor iron core materials. The detecting device comprises a C-type amorphous alloy iron yoke including first and second transverse iron yokes parallel to each other and a longitudinal iron yoke, an amorphous alloy magnetic clip connected with the right end of the first transverse iron yoke and the right end of the second transverse iron yoke, a sample iron core clamped in the amorphous alloy magnetic clip, an excitation winding wound on the longitudinal iron yoke, a measuring coil wound on the sample iron core, a current sensor connected with the excitation winding, a voltage sensor connected with the measuring coil, a PCI acquisition card connected with the current sensor and the voltage sensor, and an industrial personnel computer connected with the PCI acquisition card. The device has the advantages of reasonable structure, clear direction of the magnetic field, clear principle, simple measurement method, and realization of measurement in various excitation modes. In addition, contrast test can be performed by changing the length of an area free from magnetic clip fitting to make measurement data more accurate.