A low-complexity method based on pulse blanking for fast frequency-sweep interference mitigation in satellite navigation receivers was proposed. Different from traditional methods based on time-frequency analysis, this method converted the continuous wave interference into pulse interference through a low-pass filter, and then pulse detection and blanking were used to mitigate the interference. The interference was blanked as a pulse when it located in the pass-band of the low-pass filter. Otherwise, it was suppressed as an out-band interference when it located in the stop-band of the low-pass filter. Theoretical analysis and experimental results show that the computation complexity of this method is reduced by an order of magnitude compared with that of traditional method, and it can achieve similar interference suppression performance.