Modal parameters reflect structural dynamic properties, and damage indexes based on modal parameters can reflect changes in structural dynamic properties and can be used for bridge structural damage identification. There are many damage indexes composed of modal parameters, and each damage index identifies damage by its own changes, but it is difficult to quantify and compare the identification effect of different damage indexes by a unified standard. In view of the hinge joint damage of hollow slab bridge, this paper proposes a consistency quantification index to quantitatively describe the indication effect of damage indexes for hinge joint damage of hollow slab bridge, which is convenient for the comparison and application of various damage indexes. First, according to the damage indexes of moda parameters, the consistency quantification indexes are constructed to quantitatively describe the identification effect of different damage indexes. Then, a solid model of hollow slab bridge and hinge joint damage is established based on ANSYS, the damage conditions at three different hinge joint locations are simulated, and six different damage levels are set for each damage location. Finally, the consistency quantification index is applied to compare the identification effects of each damage index, and the change law of the identification effect of each damage index under different damage conditions is summarized. The analysis shows that the consistency quantification index can quantitatively describe the identification effect of different damage indexes under different damage conditions.