The utility model provides a medical X -ray production apparatus lumbar vertebrae limit is got one's things ready and is put, belongs to medical instrument technical field, its characterized in that: install ball shop housing (2) on ball shop (1), to limit bundle piece base (3) to install on ball shop housing (2), install draw -in groove (5) on piece base (3) are restrainted to the limit, to shelter from sheet lead (6) installs on piece (7) are restrainted to the limit, to be equipped with limit bundle piece (7) of sheltering from sheet lead (6) installs on draw -in groove (5), when the ray sends, restraint piece handle (4) through the limit and adjust the position that piece (7) were restrainted to the limit, make the ray send the shooting lumbar vertebrae through the cavity position that the piece was restrainted to the limit, thereby reach the effect that the limit was restrainted, when the operation of omission lumbar vertebrae is used, the limit can be dismantled and piece (7) normal use is restrainted.