Ultra-deep drilling side wall sampling device

The invention discloses an ultra-deep drilling side wall sampling device which comprises a bearing shell, a bearing component is arranged in the bearing shell, and a sampling component is rotationally arranged on the bearing component; the bearing component comprises a bearing plate transversely arranged in the bearing shell, a core rod is arranged on the side, close to the shell wall of the bearing shell, of the bearing plate, and the end, away from the bearing plate, of the core rod is connected with the bearing shell through a guide head. The sampling component comprises a core disc sleeving the outer wall of the core rod, the core disc can slide in the extending direction of the core rod and rotate along the axis of the core rod, at least two sampling assemblies are slidably accommodated on the core disc, the two ends of each sampling assembly penetrate through the core disc, and the two ends, penetrating through the core disc, of each sampling assembly are located in the sliding direction of the core dis