The invention discloses an extension box of storage media, which mainly utilized a plurality of heat dissipation fins protruding from a bottom surface of a bottom shell of the extension box. The heat dissipation fins efficaciously dissipate heat from the storage media, so it improves the dissipation heat efficiency and reduces breakdown for the storage media. The extension box of storage media of the present invention is electrically connected with an external electronic apparatus by a universal series bus (USB) or an IEEE 1394 interface connector for transmitting a data.