A triple-band metamaterial broadband bandpass filter (BPF) which is independent to polarization and stable at wide-angle incidence is designed, fabricated and tested. Simulation results show that the designed BPF has three broadband passbands. The center frequencies are 7.22, 10.10 ,14.46 GHz. 3 dB relative bandwidths are 17.5%, 20.2% and 17.4%. The transmission efficiencies at center frequency are -0.85 dB, -0.69 dB and -1.73 dB, respectively. This BPF is insensitive to the electromagnetic wave polarization, because the structure is rotational symmetry. Additionally, three bands of the designed BPF can still keep stable performance, when incident angle reaches 40°. By monitoring the surface current distributions at resonant frequencies, the physical mechanism of the triple-band filtering is analyzed. The proposed triple-band metamaterial broadband BPF is hopeful to take part in multi-frequency imaging technology, information communications and other fields owing to its multi-band filtering, independent to polarization and stable at wide-angle incidence.