A fight over legislation to allow vast areas of Western Australia for industries other than pastoralism could come to a head this week.

The bill has divided pastoralists and there is speculation it could be taken to Cabinet on Monday, before State Parliament breaks for the winter recess.

For more than a century the rangelands, which cover almost 90 per cent of the state, have been largely limited to grazing, but the Nationals have drafted legislation to open up the land to other industries by bringing in new lease options.

The Pastoralists and Graziers Association is urging Liberal MPs to fight the proposed bill.

PGA president Tony Seabrook said their main concern was the plan to scrap the Pastoral Lands Board.

"It's a safeguard against department action or government action that would be detrimental to the industry," he said.

"We told the minister quite a long time ago we are prepared to support the core of the legislation but not the abolition of the PLB.

"It's a dangerous and badly formed piece of legislation that will not deliver what the industry would like to see."

But some pastoralists are backing the legislation, which also has the support of an alliance of conservation groups.

David Mackenzie from the Partnership for the Outback group believes it would open up valuable opportunities for pastoralists.

"This is really going to take the brakes off the bush if these reforms are allowed," he said.

"We have exciting new industries such as carbon farming, but also some greater opportunities around tourism, Indigenous land management and the like."

Parliament will sit for the final time this week before the six-week winter recess.

Those campaigning for the changes are concerned that if the legislation is not taken to Cabinet on Monday, the Government will run out of time to deal with it before the election.