Greens leader Richard Di Natale​ says he is prepared to fight at the barricades and risk arrest to stop the Adani coal mine.

"If this mine was a country it would be the seventh largest polluter on earth," Senator Di Natale told Sky News on Sunday morning.

Senator Natale said he would join protests against the mine – which he likened to the protest against the Franklin Dam in Tasmania in the 1980s – and was not concerned about the possible risk of arrest.

"If we can't stop it in the Parliament, we'll stop it by standing in front of those bulldozers. It won't go ahead," Senator Di Natale said.