The invention discloses a
drill bit with long service life. The
drill bit comprises a
drill bit body; a wear-resistant layer is arranged on the surface of the
drill bit body; a
corrosion-resistant layer is arranged on the side, far away from the
drill bit body, of the wear-resistant layer; a high-temperature-resistant layer is arranged on the side, far away from the wear-resistant layer, of the
corrosion-resistant layer; the wear-resistant layer comprises wear-resistant pimpled rubber, a
ceramic polymer coating layer body, a high-temperature
coating layer body and a
crystal nucleus new material layer body; and the
ceramic polymer coating layer body is located on the outer side of the wear-resistant pimpled rubber. The
drill bit with long service life has the advantages that the wear-resistant layer, the
corrosion-resistant layer, the high-temperature-resistant layer, the wear-resistant pimpled rubber, the
ceramic polymer coating layer body, the high-temperature coating layer body, thecrystal
nucleus new material layer body, a primer layer body, a
coal tar enamel paint layer body, a
petroleum asphalt layer body, an
epoxy resin layer body, an organic
silicon layer body, an inorganiccoating layer body and a fire-resistant protective coating are arranged, so that the problem that the service life of a traditional drill bit is not long enough can be solved, the service life is long, and the drill bit is worthy of popularization.