The utility model discloses a cervical vertebra fixing device, including the column main part, go up extension board and extension board down, go up the extension board and set up respectively at the both ends of column main part with extension board down, the column main part, go up the extension board and down the extension board be integrated into one piece, the column main part is cavity, and align to grid has a plurality of diamond holes in the column main part, constitutes hollow out construction, be provided with two first through -holes and two first counter bores on going up the extension board, two first counter bores lie in respectively between the two first through -holes, and two first through -holes and two first counter bores bilateral symmetry respectively set up, are provided with two second through -holes and a second counter bore on the lower extension board, and two second through -hole bilateral symmetry set up, and the second counter bore lies in between the two second through -holes.