Independent Tasmanian Senator Jacqui Lambie is planning Legislation to protect prime agricultural land from extractive industries, as she meets with Liverpool Plains farmers to discuss their concerns about Shenhua's Watermark Mine on the Liverpool Plains.

Senator Lambie will meet farmers today and tour the Liverpool Plains farming region, in northern New South Wales, over the next three days.

The Senator last month spoke out against the approval of the $1.2 billion open cut coal mine, labelling it "ridiculous" in a video posted online.

The state-owned Chinese coal mine was conditionally approved by the Federal Environment Minister Greg Hunt earlier this year.

Senator Lambie said she's looking to protect the nation's food security.

"There's no national policy for prime agricultural land at this present time in Australia which is absolutely nuts," she said.

"I'll be making sure that a national policy is put forward over the next few months to protect our prime agricultural land."

She said the environmental concerns surpass electoral boundaries.

"It's very important to me and I need to make sure that it is important to everybody," Senator Lambie said.

"It's a national food security issue and it affects all Australians and that's why I'm going there.

"I do not want to see that coal mine near or on prime agricultural land and I want to make sure I can protect farmers because I'm concerned the Nationals are not doing their jobs."

Senator Lambie hasn't ruled out supporting proposed changes to national environmental legislation if the Federal Government supports her proposal to protect prime agricultural land.

The Federal Government wants to change the law to stop environmental groups appealing decisions to approve projects.

"I want to make sure that everybody is looking at it and I want to hear what Tasmanians have to say and the farmers obviously because I can tell you now my vote will affect the national outcome," she said.

"I'm being very, very careful with this but first of all I want to see Minister Hunt and I've said I want to make sure he is going to stand by me and put a national policy through for our prime agricultural land."