The invention discloses a high-speed oil seal structure which comprises an oil seal housing, wherein a plurality of sleeves are arranged on the inner side of the oil seal housing; a connecting rod isarranged between two adjacent sleeves, and two ends of the connecting rod are inserted into the two adjacent sleeves; second propping blocks are connected with both ends of each connecting rod; sliding ports communicating with the interior of one corresponding sleeve are symmetrically arranged on the inner side of the sleeve; sliding seats are slidably connected with the interiors of the sliding ports; one end of each sliding seat is connected onto the corresponding connecting rod; a rotating groove is formed in the other end of each sliding seat; a rotating rod is rotationally connected withthe interior of each rotating groove; a first propping block is arranged on the inner side of each sleeve; and mounting grooves are symmetrically formed in one side of each first propping block. Through a whole oil seal mechanism, the high-speed oil seal structure disclosed by the invention can be quickly mounted at a certain position; when a driving shaft is inserted into the oil seal mechanism,the space between an oil seal and the inner wall of an external device can be adjusted and reduced; and accordingly, the sealing effect of the whole high-seed oil seal structure can be further improved and the high-speed oil seal structure can be conveniently operated by a user.