A band rejection filter capable of reducing harmonics includes a first signal end, a second signal end, a high pass filter coupled between the first signal end and the second signal end for performing high pass filtering on signals transmitted between the first signal end and the second signal end, and a low pass filter coupled between the first signal end and the second signal end for performing low pass filtering on signals transmitted between the first signal end and the second signal end. The low pass filter includes a plurality of non-magnetic-core inductors coupled in a sequence between the first signal end and the second signal end, and a plurality of capacitors respectively coupled between an intersection of adjacent non-magnetic-core inductors of the plurality of non-magnetic-core inductors and a ground end.