The invention relates to a sealing device, belongs to the field of engineering equipment, and particularly relates to a sealing device for an electric shovel lifting winding drum. The sealing device comprises an oil deflector ring, an oil seal and a Y-shaped gland, wherein the oil deflector ring is fixed to the outer wall of the lifting winding drum, and located nearby a reduction box shell, so that the closed circular oil deflector ring is formed; the end surface of the Y-shaped end of the Y-shaped gland is tightly close to the circumferential surface of the oil deflector ring, and the other end of the Y-shaped gland is fixed to the reduction box shell; the oil seal is arranged in a Y-shaped groove of the Y-shaped gland, and makes close contact with the oil deflector ring to form a sealing structure; a labyrinth sealing structure is formed by the oil deflector ring, the reduction box shell and the Y-shaped gland. Therefore, the sealing device has the following advantages that the design structure is simple, sealing performance is good, the problems of oil leakage and oil throwing are effectively solved, the requirements of assembling are greatly reduced, the time needed by overhauling and replacement of the sealing device is shortened, and the operation and production efficiency is improved.