Special drill bit for sampling tree debris sample

The utility model discloses a special drill bit for sampling tree chip samples, which comprises a drill handle and a drill rod which are sequentially arranged along the axial direction, the drill rod comprises a positioning drill tip and a spiral cutting drill body positioned at the rear end of the positioning drill tip, and the cutting diameter of the positioning drill tip is smaller than that of the spiral cutting drill body. The spiral cutting drill body is sleeved with a spiral sampler capable of performing axial reciprocating motion, and the spiral sampler can extrude tree chippings left on the spiral cutting drill body in the axial motion process; wherein the spiral sampler comprises a shell and a cutting blade which is installed in the shell and can rotate in the circumferential direction, a chip removal through hole larger than the diameter of the spiral cutting drill body is formed in the shell in the axial direction, a spiral hole matched with the spiral cutting drill body is formed in the cutting b