This paper presents a current sensor for DC superimposed with impulse current waveform. The current sensor consists of two magnetic cores: one core works in fluxgate principle, and the other is based on Rogowski coil principle. A feedback winding is introduced into the sensor in order to integrate fluxgate principle with Rogowski coil technique. Introducing the feedback winding effectively overcomes the influence of the impulse magnetic field and DC magnetic field on the magnetic core working state. A prototype is developed based on the theoretical analysis. Test results show that the proposed current sensor can effectively measure DC superimposed with impulse current waveform with a wide bandwidth up to 340 kHz. The measurement error for DC is limited to 0.6%, and the maximum error is 1.5%, which is at cutoff point between the low frequency band and high frequency band.