The invention relates to a bearing box or gear box lubricating oil (
grease) sealing device for a rotating shaft of
mechanical equipment, in particular to an outside mounted type two-lip framework oil seal. The outside mounted type two-lip framework oil seal comprises a sealing lip, a crown part, a spring groove, a limiting step, a shoulder part, a back part, a
waist part, a secondary lip and a locating groove, wherein an integral structure of the outside mounted type two-lip framework oil seal is formed by the sealing lip, the crown part, the spring groove, the limiting step, the shoulder part, the back part, the
waist part, the secondary lip and the locating groove; the sealing lip is arranged on the outer side of the crown part; the spring groove is formed in the inner side of the crown part; the secondary lip is arranged on the outer side of the
waist part; the outside mounted type two-lip framework oil seal further comprises a circular pad type framework and an L-shaped framework; the limiting step is integrally connected with the shoulder part, the back part, the secondary lip, the waist part, the crown part, the sealing lip, the spring groove, the circular pad type framework and the L-shaped framework; a spring is arranged in the spring groove. The secondary lip is used for preventing external impurities such as
water vapor and
smoke from entering a sealing cavity; the sealing lip is used for preventing oil (
grease) in the sealing cavity from leaking outside. The oil seal thoroughly solves the problem of inconvenient online dismounting, has the advantages of simple structure, low cost, high adaptability and convenience in online replacement, and can totally replace a standard framework oil seal.