Abstract: Magnetic Barkhausen noise signal（MBN） is commonly used for nondestructive testing of materials, and MBN of soft magnetic materials under low-frequency magnetic field excitation can be used to study the deformation, stress and defects of such materials under actual working conditions. To this end, we established a measurement system that can simultaneously measure the MBN of the soft magnetic material and the hysteresis loop, including the excitation module, the signal detection module and the signal processing module. These modules enable the generation of different excitation signals and enable the detection and analysis of measured high-frequency MBN signals. We measured the magnetic field strength, magnetic induction strength and MBN signal of amalgamous alloys, silicon steel sheets and other soft magnetic material samples with the experimental platform, and processed the signals by amplification, filtering and smoothing. Then we plotted the envelope curve and MBN energy loop of MBN, and analyzed the influence of the applied magnetic field strength, excitation frequency and induction coil method on the material MBN envelope. We found that the MBN bimodal envelope increased with the increase of magnetic field strength, and became larger with the increase of the excitation frequency f_mag, but it did not change after reaching a certain frequency. The MBN envelope is mainly affected by the two induction coils at the first peak. The research results lay a foundation for the study of MBN characteristics of soft magnetic materials.