The present invention relates to a dental filling composition comprising zirconia powder, and more particularly, to a dental filling composition comprising zirconia powder, a hydraulic inorganic binding agent, a slightly acidic hardening controller agent and a pozzolan component with respect to the gross weight of the composition. The dental filling composition of the present invention comprises 45 to 85% of zirconia powder with respect to the gross weight of the composition, and comprises a minimum quantity of inorganic binding agent, thus exhibiting excellent radio opacity and hardly comprising heavy metals. Therefore, the dental filling composition of the present invention is excellent in biocompatibility, and therefore, can be safely and widely used in various dental filling operations.