Skull drill bit

The utility model discloses a skull drill bit which comprises a transmission block and a shell fixedly arranged on the outer side of the transmission block in a sleeved mode, a drill bit assembly is arranged at one end of the shell in a sleeved mode, a limiting device is arranged at the other end of the shell, the drill bit assembly is elastically connected with the transmission block, and the limiting device is detachably connected with the drill bit assembly. During use, the drill bit assembly is extruded to be connected with the transmission block in an abutting mode and rotate synchronously, after use, the drill bit assembly is separated from the transmission block under the action of elastic force and stops rotating, and the drill bit assembly is separated from the limiting device by pressing and pulling the limiting device so that the drill bit assembly can be taken down conveniently. The drill bit assembly elastically connected with the transmission block is arranged, the drill bit can be prevented fro