PURPOSE: To provide the seal lubrication device for marine counter rotating propeller shafts, which can quickly and accurately arrest a condition of sea water ingress due to damaged seal rings of an inner and outer shaft stern seal means.

CONSTITUTION: In marine counter rotating propeller shafts, an inner shaft stern seal means 7 provided for the rear section of an inner shaft 1 is equipped with a circulation oil path 26 which can suck and exhaust lubricant through an outer shaft stern seal means 6 provided for the front section of an outer shaft 2, and furthermore, an outer shaft stern seal means 8 provided for the rear section of the outer shaft 2 is equipped with a circulation oil path of a separate system, which can suck and exhaust lubricant.