The invention discloses a low-profile bidirectional locking large-angle universal pedicle screw and relates to pedicle screws for spinal posterior approach surgery. The low-profile bidirectional locking large-angle universal pedicle screw for fixation and correction through pedicle nailing during spinal posterior fixation and correction surgery is provided. The pedicle screw comprises a screw cap and a screw body, wherein a U-shaped groove is formed in the side of a spherical screw head of the screw body; the screw body is hollow; a proximal thread is formed in the proximal end of the screw body; a distal thread is formed in the distal end of the screw body; the depth of the proximal thread is smaller than the depth of the distal thread; a through hole is formed in the distal thread; the distal thread is used for injecting bone cement; a pore is formed in the tail end of the screw body and is used for injecting the bone cement; a screw cap and screw body bidirectional locking device is arranged between the screw cap and the screw body; and a locking nut is arranged on the U-shaped groove and is used for locking the U-shaped groove and a connecting rod.