The utility model relates to a marine transom sleeve provided with a shell and a liner. The outer shell is cast iron or carbon steel, the inner liner is polyurethane elastomer, and the outer shell and the inner liner are bonded and cured into one. The utility model has the advantages of wear-resistant, corrosion-resistant, low cost, simple processing, and long service life, and is an ideal water-lubricated transom sleeve for boats.