The invention belongs to the technical field of modification of high polymer materials and provides a halogen-free flame-retardant high-gloss inorganic-fiber-reinforced PC / ABS material and a preparation method thereof. The halogen-free flame-retardant high-gloss inorganic-fiber-reinforced PC / ABS material is prepared from raw materials in percentage by weight as follows: 50-55% of PC, 10-20% of ABS, 0-1% of a sulphonate flame retardant, 6-12% of a phosphorus-containing flame retardant, 2.5-5.5% of a compatilizer, 5-10% of a toughening agent, 0.3-2% of a processing aid, 0.1-1% of an antioxidant, 0.1-1% of an anti-ultraviolet agent, 10-20% of inorganic fibers and 0-1% of a metal-imitating toner. According to the halogen-free, flame-retardant, high-gloss and inorganic-fiber-reinforced PC / ABS material, the aid and all the raw materials are reasonably selected and matched, the fibers and the flame retardants are added, through reasonably optimized screw combination, high-gloss, high strength, high rigidity and flame retardant properties are obtained, meanwhile, the halogen-free, flame-retardant, high-gloss and inorganic-fiber-reinforced PC / ABS material has certain impact strength and the reasonable melt flow rate, the reasonable thermal deformation temperature, the reasonable Vicat softening temperature and the like, and a high-gloss mirror effect can be realized.