A communication terminal compatible with multiple smart cards includes a socket for inserting a standard smart card and a chassis for making the socket fitting at least one of small and ultra-small types of smart cards. The small smart card and the ultra small smart card insert into the socket through the chassis. The present communication terminal proposes a mobile terminal compatible with 3FF and/or 4FF card because of the arrangement of the correspondent chassis in the case that it only arranges 2FF card socket.