The NSW government will expand the national parks estate by 200,000 hectares over the next two years if Matt Kean, the Energy and Environment Minister gets his way.

In a Facebook post on Sunday evening, Mr Kean said his goal was necessary to shore up protection for the state's many threatened species.

NSW Energy and Environment Minister, Matt Kean (right), with Deon van Rensburg, of the Greater Sydney Branch of the National Parks and Wildlife Service, in Bobbin Head, Ku-Ring-Gai National Park. Credit:Janie Barrett

"National parks are key to protecting our native animals and our natural environment," Mr Kean said in the post, noting they were home for 85 per cent of NSW's threatened species.

"I am determined to protect and increase [national parks]," he said. "That's why I want to see 200,000 more hectares added to our national park estate over the next years."