Billionaire mining magnate Clive Palmer has accused the Australian Greens of being in cahoots with a "foreign power" and the CIA to eat away at Australia's economic advantage.

But he denies he is a conspiracy theorist.

Mr Palmer launched an extraordinary attack on the Greens and environmentalists during a press conference on Tuesday, saying they were being funded by the US spy agency to undermine Australia's national economy.

A leaked plan by an Australian anti-coal group to thwart coal projects is proof of the accusation, he says.

Mr Palmer said the document showed the anti-coal group was funded by the US Rockefeller Foundation, an American philanthropic group he described as a conduit of the CIA and the US government.