The Queensland Greens have unveiled an election policy in which they would raise the coal royalty rate to similar levels used in Canada and the United States.

They say the higher royalties would net an extra $20 billion over five years to fund infrastructure projects.

The Greens propose lifting Queensland's coal royalty rate to raise money for infrastructure. Credit:Robert Rough

The Greens would lift the royalty paid in Queensland from 7 per cent to 18.75 per cent if the party won enough seats at the next state election to influence policy.

They would also raise the royalty paid by gas companies in Queensland from 10 per cent to 18.75 per cent, similar to royalties paid in Canada and the US.