Coal seam spot sampling device

The utility model relates to a coal seam fixed point sampling device which comprises a drill bit and a drill rod connected to the tail end of the drill bit, the drill bit is hollow, a sampling opening is formed in the front end of the drill bit, an installation groove is formed in the inner wall of the tail end of the drill bit, a sealing groove is formed in the inner wall of the installation groove, and a sealing ring is installed in the sealing groove. An annular guide block located on the rear side of the abutting face is fixed to the circumferential side face of the front end of the drill rod, the annular guide block is sleeved with a sleeve capable of rotating around the axis of the drill rod, the sleeve is in threaded connection with the circumferential side face of the tail end of the drill bit, the rear end of the drill rod is connected with an extension rod, and the circumferential side face of the front end of the extension rod is slidably sleeved with a rotatable positioning shell. An annular fixin