The present invention relates to earthquake-resistant reinforced concrete water tight conduit and a method of manufacturing same, and in particular discloses a reinforced concrete water tight conduit furnished with a coupling means of a separate material at both ends, and a method for manufacturing such water tight conduit. To this end, the present invention relates to a reinforced concrete conduit of known type, wherein a reinforcement rib net assembled with vertical ribs and horizontal ribs is located in the inner layer of concrete, and wherein a prominence coupling means furnished with coupling projections and a depression coupling means furnished with coupling grooves are furnished at both ends of the conduit mold, but the prominence coupling means and depression coupling means described above have been formed and processed precisely with a synthetic resin having the same form and thickness as reinforced concrete but different physical properties, and a metallic core is built inside to elevate strength of such prominence coupling means and depression coupling means.