Ali Mirshekari and Mohammad Ali Mokhtari scored two goals each as well as goals from Mehdi Shirmohammadi, Reza Amirizadeh, Movahed Mohammadpour and Ali Nazem.
Japan also won the bronze medal, beating Saudi Arabia 3-1.
It was a historic occasion for Iran as it not only emerged back-to-back champion for the first time but also the Sunday's triumph put the team ahead of Japan as the only four-time champion.