The invention discloses a pedicle screw, which comprises a screw rod, a fixing cap and a screw plug, wherein the screw rod is provided with an external screw thread part, the fixing cap is hinged with the tail part of the screw rod, the top end of the fixing cap is provided with an internal screw thread fixing hole, the screw plug is arranged in the internal screw thread fixing hole, a connecting rod installing hole of which the axis is coincided with the normal line of the surface of the fixing cap is also arranged on the fixing cap, the pedicle screw also comprises two arc-shaped leaf springs symmetrically arranged on the fixing cap, one ends of the leaf springs are fixedly connected with the fixing cap, and the other ends of the leaf springs are outwards unfolded. After the pedicle screw provided by the invention is fixedly arranged on the vertebral body, the leaf springs expand open the peripheral muscle, skin and other tissue, surgery doctors can touch through fingers under the direct viewing condition for placing in the connecting rod, and the problems of complicated operation, long time and high difficulty caused by poor view sight of the existing spine percutaneous internal fixing system are solved. The invention also provides a spine percutaneous internal fixing system.