A microwave photonic third-order intermodulation distortion complete suppression system based on the DPMZM comprises a microwave source, a phase control module, a bias control module, a laser, the DPMZM and a photoelectric detector. By the phase control module, the four radio frequency electric signals loaded on the four driving electrodes of the dual driving DPMZM possess the fixed phase difference, a DC bias control unit is combined to carry out the DC bias point control on the uplink MZM and the downlink MZM of the DPMZM, and the phase difference control among the four radiofrequency signals is realized by utilizing two 180-degree phase shifters, thereby realizing the third-order intermodulation complete suppression of a broadband microwave photonic communication link. The microwave photonic third-order intermodulation distortion complete suppression system based on the DPMZM has the characteristics of being low in design complexity, high in stability and good in repeatability and being simple to realize, can solve the broadband microwave photonic communication high linearization demand, and guarantees the high bandwidth and large dynamic range of a broadband microwave photonic communication system.