The invention relates to a ZnWO4-coated aluminum borate whisker-reinforced aluminum matrix composite and a preparation method thereof, belonging to the field of aluminum matrix composites. The invention aims at solving the technical problems that existing aluminum borate whiskers and an aluminum matrix are poorer in wettability of an interface and easy to delaminate, and the aluminum borate whiskers can be reacted with the aluminum matrix for reducing mechanical properties. The product is prepared from zinc tungstate, the aluminum borate whiskers and the aluminum matrix; and the method is as follows: preparing suspension of the aluminum borate whiskers; dripping zinc nitrate solution and sodium tungstate solution in the same molar concentration; and preparing the ZnWO4-coated aluminum borate whisker-reinforced aluminum matrix composite through a pressure infiltration method. The zinc tungstate is coated on the aluminum borate whiskers in the ZnWO4-coated aluminum borate whisker-reinforced aluminum matrix composite for improving the wettability of the whiskers and the matrix. As the zinc tungstate is relatively stable in chemical properties, the occurrence of interface reaction canbe prevented and the mechanical properties of the material can be significantly improved. In addition, a ZnWO4 coating has the capability of radiation protection of a high-energy photon beam, so thatthe aluminum matrix composite disclosed by the invention has the advantages of light weight, high strength and radiation protection property.