The invention provides a system and method for measuring magnetic properties of a silicon steel material under a DC magnetic bias state. The system provided by the invention is additionally provided with a DC power supply unit formed by a DC power supply, an inductor and a capacitor on the basis of a standard silicon steel material measurement system composed of an AC power supply unit and a monolithic permeameter, wherein the DC power supply unit is connected with the standard silicon steel material measurement system in series so as to provide bias current for a DC magnetic bias test system,the DC power supply unit provides an AC path by using the capacitor, thus the DC power supply is not affected by the alternating current, the DC signal fluctuation generated by the DC power supply isreduced, and the DC flux is measured on a secondary winding by adopting a fluxmeter. The method achieves measurement for the DC magnetic bias properties of the silicon steel sheet material under highmagnetic field intensity, effectively realizes the separation of an AC magnetic field and a DC magnetic field and obtains a DC magnetic induction intensity component passing through a silicon steel sheet sample under the DC magnetic bias state.