The present invention relates to a complex composition of styrene-based block copolymer and PBT resin and, more particularly to, a complex composition of styrene-based block copolymer and PBT resin that uses a mixture of a styrene-based block copolymer, a paraffin oil and a polybutylene terephthalate (PBT) resin to compensate for the unfavorable factors of thermoplastic rubber (TPR), that is, the defects of properties, including weather resistance, thermal resistance, oil resistance, adhesiveness, and printability, etc., and to improve processability. In one preferred embodiment of the present invention, the complex composition comprises 10 to 200 parts by weight of a paraffin oil and 20 to 200 parts by weight of a polybutylene terephthalate (PBT) resin with respect to 100 parts by weight of a styrene-based block copolymer.