The utility model discloses a titanium plate system for enlarging and forming canalis vertebralis of cervical vertebra. The titanium plate system comprises a main plate, wherein a bending end fixed on a side block of the cervical vertebra extends at the end part of one end of the main plate, a first mounting hole position is formed at the bending end, a second mounting hole position for fixing the main plate at the base part of a spinous process of the cervical vertebra is formed at the other end of the main plate, and a guide groove is formed on the side of the second mounting hole position; the titanium plate system further comprises a sliding hook which can slide on the guide groove and can be fixed to adjust the expanding width of a door opening side, a locating hole is formed on the sliding hook, an anti-slip spike is arranged on the surface where the sliding hook is in contact with the section of a vertebral plate of the door opening side, an inner expanding claw is arranged on the other opposite surface and on the side of the locating hole in a protruding manner, the sliding hook is arranged on the main plate, the inner expanding claw is embedded on the wall of the guide groove; and the titanium plate system further comprises a locating mechanism which is used for fixing the sliding hook on the main plate through the locating hole. An original bolt which is fixed on the vertebral plate of the door opening side is changed to be fixed on the base part of the spinous process; therefore, the fixing intensity is obviously enhanced.