Clive Palmer has told Queenslanders they should either "put up or shut up" when it comes to a federal inquiry into the State Government.

On Wednesday, the Palmer United Party (PUP), the Federal Opposition and the Greens announced they had combined to set up the six-month select committee.

The inquiry would have broad terms of reference to look into the use of Commonwealth funds, the administration of the courts and judicial system, and development and environmental approvals, including for coal seam gas projects.

The select committee, which would consist of five members, with only one from the Coalition, had a reporting date on or before March 27 next year, three days after the scheduled Queensland election.

It would sit across the state, from Ipswich to Brisbane, Kingaroy and Townsville.

"It's up to individuals to either put up or shut up," Mr Palmer told media in Brisbane today.

"For a long time people have attacked the Queensland Government. The Queensland Government said it's been unfair.

"Who knows, but now it's the time for those people who have got all of these complaints to come forward."

Mr Palmer said his own submission to the inquiry "might take me until Christmas there's so many things I can write about".

"We'll see how it goes," he said.

He said it would be a "travesty of justice" if Premier Campbell Newman and Deputy Premier Jeff Seeney did not give evidence or decided not to participate.

"You'd have to wonder if they're guilty of something," he said.

"I'm sure they'll be really keen it get out there on the front foot and tell people what a good job they've done.

"I would be very critical if the inquiry didn't allow the Premier and Deputy Premier and all the Ministers of the Queensland Government to present evidence if they thought it would be helpful."

Mr Palmer said he would be willing to appear at the inquiry if called as a witness.