Laarayedh, 69, was leader of the Islamist party Ennahdha, which briefly governed Tunisia following a popular uprising in 2011 that launched the Arab Spring. He is a critic of President Kais Saied.
Laarayedh denied the charges and his lawyers branded the case politically motivated.
The Tunis criminal court on Friday also handed 26-year sentences to two former members of the security forces, Fathi Al-Baldi and Abdul Karim Al-Abidi, several media reported.
It was the latest in a series of prosecutions targeting people critical of Saied.
The UN said about 5,500 Tunisians fought with jihadist groups including the Islamic State in Iraq, Syria and Libya between 2011 and 2016.
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