Drilling sampling device for geological exploration operation

The invention relates to a geological exploration operation drilling sampling device, and relates to the technical field of core sampling. The drilling barrel is connected with the machine body in a liftable mode and provided with a vertically-through center hole, the bottom end of the drilling barrel is rotationally connected with an annular drill bit, and a cut-off tool is slidably connected into the drill bit in the radial direction; the lifting assembly is arranged in the drilling barrel and used for sending out the rock core from the top end of the drilling barrel; the middle turntable is rotationally connected to the top end of the drilling barrel; the guide assembly comprises a support fixedly connected with the drilling barrel and a volute plate fixedly connected with the support, the support passes through the upper portion of the middle rotating disc, and the volute plate is arranged above the middle rotating disc and provided with a discharging port in the circumferential direction; the pushing ass