Pedicle screw and spine minimally invasive internal fixation system

The invention provides a pedicle screw and a spine minimally invasive internal fixation system. The pedicle screw comprises a screw seat and an extension assembly; the screw seat comprises a first connecting piece; a connecting groove is formed in the outer wall of the first connecting piece, and the connecting groove is provided with an anti-retreating structure; the extension assembly comprises a second connecting piece; a connecting protrusion is arranged on the inner wall of the second connecting piece; the first connecting piece and the second connecting piece are connected in a rotary sliding fit mode through the connecting groove and the connecting protrusion, and the anti-retreating structure can prevent the connecting protrusion from retreating from the connecting groove. According to the pedicle screw and the spine minimally invasive internal fixation system, the extension assembly and the screw base are connected easily, conveniently and firmly, and the problem that in an existing minimally invasiv