Reinforced flame-retardant PC/ABS alloy material and preparation method thereof

The invention provides a reinforced flame-retardant PC/ABS alloy material and a preparation method thereof. The reinforced flame-retardant PC/ABS alloy material comprises a resin matrix, reinforced fibers and a flame-retardant additive, the resin matrix comprises polycarbonate, an acrylonitrile-butadiene-styrene copolymer and a compatilizer, the reinforced fibers are surface modified aramid fibers, and the flame-retardant additive comprises a brominated flame retardant. The preparation method of the reinforced flame-retardant PC/ABS alloy material comprises the following steps that all the resin raw materials and the auxiliaries are added into a premixer according to the component proportion to be evenly mixed, a premix is obtained, the premixer is a high-speed mixer or a low-speed mixer, and the mixing time ranges from 10 min to 20 min; adding the premix into a twin-screw extruder for extrusion granulation, adding aramid fibers through a side feeding device, processing at 230-260 DEG C, drying after granulat