The utility model discloses a long distance submarine cable sea area monitoring device, including front end control station and submarine cable remote monitoring center, front end control station including video acquisition module, radar modules, satellite AIS receiving module, remote control module, data transmission module, the video acquisition module: with the linkage of communicating of radarmodules, satellite AIS receiving module for shoot submarine cable sea area top sea shippping traffic image information. The utility model discloses can realize all -weather, all -round, the wide effective monitoring that covers of extra large cable sea area boats and ships. And can carry out right >= 5km's under night, the dense fog isabnormal weather condition the all -weather security monitoring of sea motion target.