The invention discloses a low-order and high-impact resistance PC/ASA (polycarbonate/acrylonitrile styrene acrylate) blended material and a preparation method thereof. The PC/ASA blended material comprises the following raw materials in percentage by weight: 20 to 80 percent of PC, 10 to 55 percent of acrylonitrile-styrene grafted copolymer, 5 to 35 percent of ASA grafted copolymer, 2 to 15 percent of compatilizer and 0.2 to 2 percent of deodorant. The preparation method comprises the following steps of placing the mixed raw materials in a main barrel of a twin-screw extruder with a screw diameter of 35mm and a length-to-diameter ratio L/D of 36, sequentially controlling the temperature from a charging hole to an outlet of a head of the main barrel in nine stages to be 200 DEG C, 230 DEG C, 255 DEG C, 255 DEG C, 255 DEG C, 255 DEG C, 255 DEG C, 255 DEG C and 240 DEG C, cooling extruded strips by using a water tank, and performing grain-sized dicing on the strips to obtain the product, wherein the rotating speed of each of double screws is 300 revolutions per minute. An automotive interior trim part product manufactured from the PC/ASA blended material obtained by the scheme has the advantages of low odor, high impact resistance, high weather resistance and the like; the PC/ASA blended material can be widely applied to automotive interior trim parts such as a sunshield and an automotive dashboard.