The invention relates to a precise classifying and sampling device and device of a continental tight reservoir lamina structure. The device comprises a cutting pedestal system, a laser positioning system, a picture pick-up system, a mechanical arm system and a master control system; the cutting pedestal system is used for clamping a rock sample and providing a cutting sampling space for the rock sample; the laser positioning system is used for sending a laser signal to the cutting pedestal system, establishing a work space plane coordinate system by combining the cutting pedestal system, and positioning the rock sample; the picture pick-up system is used for monitoring a complete image of the working space system and sending the monitored image to the master control system; the master control system sends a sample cutting instruction to the mechanical arm system according to the established working space plane coordinate system, the coordinate value data of the rock sample and the complete image of the working space system; and the mechanical arm is used for cutting and sampling the tight reservoir rock sample. The device disclosed by the invention can be extensively applied to theclassifying and sampling field of the tight reservoir rock.