The invention discloses a dental repair filling material and a preparation method thereof. The preparation method comprises the following steps: mixing calcium dihydrogen monohydrate phosphate, anhydrous calcium dihydrogen phosphate, calcium hydrogen phosphate dihydrate, anhydrous calcium hydrogen phosphate, antibiotics, dipotassium phosphate and magnesium chloride and then grinding to obtain mixed powder M; mixing the mixed powder, a solvent, an adhesive, a fiber filler and a biological filler to obtain the dental repair filling material; the problems of long setting time and relatively-insufficient compressive strength of a traditional filling material are solved.