The invention discloses a broadband wavelength and bandwidth-tunable filter based on cascaded interleavers, which comprises at least two cascaded interleavers, wherein the interleaver in each stage is formed by a micro loop-assisted MZI; one end of one arm of two single rings of a first-stage interleaver for realizing tunability on the wavelength and the bandwidth and switching of a complementary spectrum serves as an input end, and the other end is connected with one end of one arm without pi phase shifting of a second-stage interleaver for realizing tunability on the wavelength and switching of a complementary spectrum; and the other end of one arm without pi phase shifting of the second-stage interleaver is an output end. The broadband wavelength bandwidth-tunable filter based on cascaded interleavers has the advantages of single resonant peak within a broadband (such as 20 nm), square filtering spectrum, continuously tunable wavelength in the broadband and continuously tunable bandwidth.