The utility model provides a boats and ships sewage treatment system. This boats and ships sewage treatment system, including buffering cabinet, grinding pump, control box and aeration cabinet, grinding pump is passed through to the lower part of buffering cabinet and first outlet pipe communicates to the upper portion of aeration cabinet, be equipped with an aeration equipment in the buffering cabinet, the upper portion of buffering cabinet feeds through the inlet tube, and the circulation is smashed through grinding pump and circulating pipe in the bottom of buffering cabinet, be equipped with the 2nd aeration equipment, agitator, soft filler, first electrode and second electrode in the aeration cabinet. Above -mentioned boats and ships sewage treatment system, aeration cabinet take " intake for the first time - - - aeration for the first time - - - intake for the second time - - - the stirring - - - aeration - - - sediments - - - drainage for the second time ", promptly " intake - - - good oxygen - - - intake - - - the anaerobism - - - good oxygen - - - sediments - - - drainage " the intermittent type operational mode owing to be equipped with twice aeration and stirring processing, can react the organic matter of aquatic and get rid of, carried on to the ammonia nitrogen that oxygen nitrifies, the anti - nitrification treatment of anaerobism.