Five others had been arrested, the report said.
In June, 27 people died after an attack on one of Kuwait`s oldest Shia mosques.
It was the worst terror attack in decades in the predominantly Sunni Muslim country. An affiliate group of IS calling itself Najd Province claimed responsibility for the attack.
IS has also claimed responsibility for last weeks attacks in Paris and Beirut.
Kuwait`s interior ministry said the cell had been helping to recruit fighters and raised money that was being funnelled to IS-related bank account in Turkey.
It said four members of the cell were outside Kuwait, including two Syrians and two Australian-Lebanese. It was unclear whether those four had been arrested.
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