Combined type sealing ring of hub bearing and machining method thereof

A combined type sealing ring of a hub bearing, comprising a first skeleton mated with an outer ring, and a second skeleton and a third skeleton which are used for being mated with an inner ring, wherein the first skeleton comprises a first connecting portion and a first sealing portion disposed horizontally, the first sealing portion is provided with a sealing lip, the second skeleton comprises a second connecting portion attached to the inner ring and a second sealing portion extending toward an outer diameter surface of a transmission shaft, the third skeleton comprises a third connecting portion and a third sealing portion, one end of the third connecting portion is fixedly connected to the third sealing portion, the other end of the third connecting portion and an end of the second connecting portion are welded, a clearance groove is formed between the third sealing portion and the first sealing portion, and one end of the third sealing portion connected to the third connecting portion is connected to the second connecting portion through spot welding.