Labyrinth seal protection device for rolling mill bearing

The utility model discloses a labyrinth seal protection device for a rolling mill bearing, which relates to the technical field of bearing sealing, and is characterized in that an oil seal is arranged between a roll ring and a bearing end cover, the labyrinth seal protection device also comprises a bearing seat convex sealing ring which is arranged on the end surface of the bearing end cover facing a roll body, and a roll concave sealing ring which is arranged on the roll ring, the roller concave sealing ring is provided with an annular groove with a notch facing the end face of the bearing end cover, the bearing seat convex sealing ring is provided with a water retaining ring inserted into the annular groove, the water retaining ring and the annular groove form a labyrinth seal in clearance fit, and the bottom of the water retaining ring is broken to form a water outlet. The bearing end cover is provided with a cover body part and a shaft sleeve part protruding out of the cover body part in the axial directi