Provided are a sealing device and a manufacturing method thereof. The sealing device comprises a rubber part with a sealing lip and a sealing lip contact component in contact with the sealing lip. Therubber part and the sealing lip contact component are both annular. The sealing device is characterized in that the contact surface, in contact with the sealing lip contact component, of the sealinglip and/or at least part of the contact surface, in contact with the sealing lip, of the sealing lip contact component are/is a wavy surface.