Modular series pedicle screw and assembly tool

The utility model discloses a modular series pedicle screw and an assembling tool, and belongs to the technical field of orthopedic implants, the modular series pedicle screw comprises a screw seat and a screw rod which are arranged in a split mode, the screw seat is provided with a U-shaped groove used for placing a connecting rod, the U-shaped groove is internally in threaded connection with a screw plug, and the screw plug is connected with a screw rod. A ball head is arranged at the upper end of the nail rod, a nail point is arranged at the lower end of the nail rod, the large-diameter profile and the small-diameter profile of a thread on the nail rod are each of a shuttle-shaped structure, and each shuttle-shaped structure comprises a first conical section close to the nail point, a straight section located in the middle and a second conical section close to the ball head. The first conical section and the second conical section are gradually widened in the direction from the nail point to the ball head.