The two MPs are from the Islamist Karama party.
Five lawmakers have now been imprisoned since July when President Kais Saied took over governing powers.
Nidal Saudi was accused of insulting airport security staff months ago.
The other MP, Saif Eddine Makhlouf, was accused of threatening judges and accusing them of being involved in a coup when he was denied permission to represent Mr Saudi as his lawyer.
Mr Makhlouf has been a critic of the president.
In July, President Saied swept aside the government, suspended parliament and took control of the country.
His opponents accused him of staging a coup but his measures were broadly welcomed by Tunisians.