CT puncture guiding and positioning device and system

The invention discloses a CT puncture guiding and positioning device and system. The CT puncture guiding and positioning device comprises a side guide rail and a guide rod. The two side guide rails are arranged in parallel, and a sliding seat is arranged on the side guide rails; the two ends of the guide rod are fixedly arranged on the sliding seat; the guide rod is provided with a sliding cylinder capable of sliding along the bending path of the guide rod. A laser emitting part and a puncture needle guiding part are mounted on the sliding cylinder; an upper mounting plate and a lower mounting plate are arranged in the circumferential direction of the sliding cylinder; the laser emitting part is arranged on the upper mounting plate, and the end part of the laser emitting part is arranged towards the circle center of the guide rod; the puncture needle guide piece is arranged on the lower mounting plate, and the end part of the puncture needle guide piece is arranged towards the circle center of the guide rod;