The invention relates to a roller bit bearing W-shaped sealing structure. The roller bit bearing W-shaped sealing structure consists of a roller cone, a bearing and a W-shaped sealing ring. One side, which is close to the bearing, of the W-shaped sealing ring is provided with two projections and a groove; one side, which is close to a roller cone inner hole, of the W-shaped sealing ring is provided with three projections and two grooves; the projections and the grooves are arc-shaped, and are uniformly and alternately distributed in the axial direction; through a compression effect, axial sealing and radial sealing are realized; and other sides of the W-shaped sealing ring are oblique lines. By the W-shaped sealing structure, the contact area of the sealing ring is reduced, friction heat is reduced, sealing temperature is reduced, and the service life of the sealing ring is prolonged; by the cross-over design of the projections, multi-level sealing is realized, valuable space of a bit is saved, and sealing reliability is improved; the W-shaped sealing structure has a good self-sealing effect, under the effect of pressure, the projections are matched with a sealing surface tightly, and sealing performance is good; and when the grooves have certain volume, lubricating grease can be stored, and lubricating property is good.