Petroleum machinery drill bit with long service life

The utility model relates to a petroleum machinery drill bit with long service life, which comprises a petroleum drill bit, a speed adjusting mechanism is arranged on the lower surface of the petroleum drill bit, the speed adjusting mechanism comprises a butt joint and a bolt seat, and two electric lifting sliding tables are fixedly arranged in the butt joint. Connecting rods are movably connected to the sides of the opposite faces of the two electric lifting sliding tables correspondingly, and a telescopic sleeve is fixedly connected between the two connecting rods. According to the petroleum mechanical drill bit with the long service life, by arranging the speed adjusting mechanism, the temperature of the diamond position of the petroleum drill bit can be monitored, when the temperature rises continuously and exceeds a preset threshold value, the temperature can be reduced by automatically adjusting the rotating speed of the petroleum drill bit, and therefore damage to the petroleum drill bit by the tempera