PURPOSE: A UL 94V-second grade flame retardant acrylonitrile-butadiene-styrene copolymer resin composition is provided, wherein the composition shows excellent thermal stability, heat resistance, weather resistance and coloring property. CONSTITUTION: The acrylonitrile-butadiene-styrene copolymer resin composition comprises 100 parts by weight of an acrylonitrile-butadiene-styrene copolymer resin; 5-15 parts by weight of an end-capped brominated epoxy resin; 0.1-1.0 parts by weight of a tin maleate-based compound; and 0.05-0.5 parts by weight of hydrotalcite. The acrylonitrile-butadiene-styrene copolymer resin comprises a graft copolymer obtained by graft polymerizing a butadiene-type rubber, an isoprene-type rubber, a butadiene-styrene copolymer rubber or an alkyl acrylate rubber to a styrene monomer and an acrylonitrile monomer, and a copolymer obtained by copolymerizing a styrene monomer and an acrylonitrile monomer, whose rubber content is 10-20 wt%, whose styrene-acrylonitrile content is 20-25 wt%, and which has a weight average molecular weight of 100,000-140,000. Preferably the end-capped brominated epoxy resin has a molecular weight of 500-3,000 and is represented by the formula I, wherein n is an integer of 0 or more.
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