The invention discloses an AS (Acrylonitrile-Styrene) carrier master batch, which is prepared from the following components in percentage by weight: 19.9 to 20.1 percent of styrene-acrylonitrile copolymer AS, 0.1 to 0.3 percent of additive, 0.4 to 0.6 percent of calcium stearate and 79.2 to 79.4 percent of talcum powder. During preparation, the talcum powder is firstly put; afterwards, a polyolefin elastomer is added; an obtained first mixture is blended; subsequently, a copolymer of acrylonitrile and styrene and the calcium stearate are added; finally, the additive is added; an obtained mixture is subjected to banburying and heated to 210 DEG C, is heated for 15 to 20 minutes, and subsequently, is enabled to enter a double screw extruder to be mixed; after mixing, the extrusion, the cooling and the pelletization are carried out. Through the way, the AS carrier master batch is suitably used in the aspect of plastic modification, and due to the compact form and the higher compound quantity of the AS carrier master batch, plastic is enabled to be good in dispersity, resistant to wear, resistant to scraping, easy to feed and good in heat stability.