The invention relates to a microwave double-frequency bandpass filtering device which comprises two three-section type hair-clip-shaped stepped impedance resonators (1, 2, 3) and (4, 5, 6) and two stepped impedance resonators (7) and (8), wherein the two three-section type hair-clip-shaped stepped impedance resonators are symmetrical and in gapless coupling through (3) and (6), the stepped impedance resonators (7) and the (2) in the three-section type hair-clip-shaped stepped impedance resonator (1, 2, 3) form a side-coupled feeding structure, the stepped impedance resonators (8) and the (5) in the three-section type hair-clip-shaped stepped impedance resonator (4, 5, 6) form a side-coupled feeding structure, the (11) end of the stepped impedance resonator (7) is an input port, and the (12) end of the stepped impedance resonator (8) is an output port. On the premise that the circuit area and the processing complexity are not increased, the filter can realize the double-frequency bandpass filtering function by adopting the symmetrical three-section type hair-clip-shaped distribution structures and the side-coupled feeding structures; and the invention also has the advantages of compact design, easy integration and convenient circuit processing.