Rotary lip labyrinth sealing device

The invention provides a rotary lip labyrinth sealing device. The rotary lip labyrinth sealing device at least comprises a stationary ring and a movable ring which sleeves a rotating shaft and rotates along with the shaft, wherein the stationary ring and the movable ring are respectively of a double-layer structure, and the movable ring and the stationary ring are mutually staggered and buckled; a channel with an S-shaped cross section is formed between the stationary ring and the movable ring together, and the channel is radially provided with three layers, i.e., a lubricating oil channel, a grease isolation channel and a sewage channel from the inside to the outside; sealing lips projected toward the inside are arranged in the channels, and an oil return chute leading to a sealing cavity is axially formed in the bottom in the lubricating oil channel; a dirt discharge chute leading to the outside is axially formed in the bottom in the sewage channel. The rotary lip labyrinth sealing device provided by the invention solves the deflects of the prior art, not only prevents lubricating oil in the sealing cavity from leaking, but also prevents outside contaminants from entering the sealing cavity, and has a long service life and wide applicability.