Cone bit for high-speed and high-temperature drilling

The invention discloses a cone bit for high-speed and high-temperature drilling, which comprises a cone and a cone leg, wherein a sliding sleeve is arranged between a cone shaft hole and a cone leg shaft neck and a floating gasket is arranged on a thrust surface of the cone leg shaft neck; and a sealing groove is arranged at a position close to the opening of the cone shaft hole, an elastic sealing ring is arranged in the sealing groove, the section shape of the sealing ring is an oblate shape, the sealing ring comprises an outer ring and an inner ring, the material of the inner ring is one of polytetrafluoroethylene, nylon and aramid fiber, and the material of the outer ring is acrylonitrile-butadiene rubber, high-unsaturated acrylonitrile-butadiene rubber, polyacrylate rubber and fluororubber. In the invention, the life of the cone bit is prolonged, the drilling efficiency is improved, and the drilling cost is lowered.