Maverick independent senator Jacqui Lambie has deepened her attack on the Greens, likening the party to the terrorists of Islamic State.

Senator Lambie chose a speech to a minerals industry conference in Queenstown on Tasmania's west coast on Friday to make what she said was a joke at the Greens' expense.

Independent senator Jacqui Lambie has compared the Greens with Islamic State. Credit:Alex Ellinghausen

"What's the difference between the Greens and ISIS?", Senator Lambie said. "The answer is: Not very much! They both want to take us back into the dark ages."

Her claim follows recent remarks in the Senate, when she said: "We could stop driving cars, stop using electricity, and go back to living like people in the middle ages, which is the vision that the Greens - and Islamic State - have for the world."