The utility model provides a seal ring for ladle pipe, belongs to ferrous metallurgy casting machine technical field. Including inlayer asbestos washer, iron sheet, rings and outer asbestos washer, inthe middle of the iron sheet was located inlayer asbestos washer and outer asbestos washer, inlayer asbestos washer and outer asbestos washer be for linking to each other or do not link to each other, and rings are on the iron sheet top and be connected with it. The advantage lies in, reduce cost, conveniently operates, alleviates intensity of labour, improves liquid steel cleanliness, the long mouth of a river life of extension.