Automatic rock powder sampling device of cone drill

The utility model relates to the field of rock powder sampling, and discloses an automatic rock powder sampling device of a roller bit, which comprises a plurality of groups of tracks or support legs, a drilling machine worktable fixedly mounted at the tops of the tracks or support legs, a drilling machine cab fixedly mounted on one side of the top of the drilling machine worktable, and a controller fixedly mounted at the top of the drilling machine cab. A GPS is fixedly installed on the top of the drilling machine cab, a drilling machine automatic depth measuring module is arranged on the drilling machine workbench, a drill rod is connected to the drilling machine workbench, a drill bit is fixedly installed at the end, penetrating through the drilling machine workbench, of the drill rod, a rock powder classifier is arranged on the drilling machine workbench, and a lining oil film backflow pipe is connected to one side of the rock powder classifier. The lower end of the lining oil film return pipe penetrates