The invention discloses a broadband band-pass filter based on a spiral defected ground. The broadband band-pass filter based on the spiral defected ground is obtained through a micro-strips and comprises a micro-strip substrate, a bottom ground and a top micro-strip circuit, wherein line troughs which are in odd symmetry about the center and are mutually nested are formed in the bottom ground, the line troughs are respectively of a spiral structure, two spiral trough lines which are in odd symmetry about the center and are nested with each other in a coupling mode are formed in each wiring duct, and a trough line resonator of a spiral structure is formed by every two corresponding spiral trough lines; the top micro-strip circuit comprises an input tap, an output tap, a first stepped impedance feeder and a second stepped impedance feeder, the first stepped impedance feeder and the second stepped impedance feeder correspond to the peripheral trough lines of the mutually nested spiral trough lines in the bottom ground, and the first stepped impedance feeder and the second stepped impedance feeder in the top micro-strip circuit are coupled with the trough line resonators of the bottom ground so that a resonant model can be stimulated. The broadband band-pass filter based on the spiral defected ground is simple and compact in structure and high in band-passing property and band-stopping property, and microwave circuit integration can be achieved conveniently.