The invention discloses an inorganic particle reinforced PC/PET alloy. The inorganic particle reinforced PC/PET alloy contains the ingredients in percentage by mass: 40-60% of PC, 5-30% of PET, 10-20% of inorganic particles, 2-5% of compatibilizer, 0.5-2% of photostabilizer, 0.5-1% of coupling agent, 0.1-0.5% of primary antioxidant, 0.1-0.5% of secondary antioxidant and 0.5-2% of lubricant. The inorganic particle reinforced PC/PET alloy has the beneficial effects that compared with the prior art, the inorganic particle reinforced PC/PET alloy disclosed by the invention has the advantages that the inorganic particle reinforced PC/PET alloy simultaneously has inherent advantages of PC and PET, the property defect of a single ingredient is made up, the inorganic particle reinforced PC/PET alloy also has the characteristics of high strength, good rigidity, excellent heat resistance and corrosion resistance, good weatherability, excellent electric properties and processability and the like, and the cost of the inorganic particle reinforced PC/PET alloy is low, so that the inorganic particle reinforced PC/PET alloy has a very good application prospect in the fields of automobile industry, electronic appliances, mechanical components and parts, architecture and the like.