A spinal clamping device includes a clamping member provided with a clamping portion and a connecting portion, a clamping adjusting member provided with a clamping portion and a connection portion, a distance adjusting cord of multiple strands, and a cord restraining member. The connecting portions of the clamping member and the clamping adjusting member are provided respectively with one or more cord receiving holes. Each of the multiple strands of the distance adjusting cord has one end that is fastened to the cord receiving hole and another end that is fastened with the cord restraining member. Each of the multiple strands passes through or loops the cord receiving hole of the clamping adjusting member for adjsuting the distance between the clamping member and the clamping adjusting member. The multiple strands of the distance adjusting cord are substantially on a same plane and parallel to one another.