NSW is set to introduce the country's toughest penalties for animal activists who invade farms, ranging from fines for trespassing to possible jail time.

Deputy premier John Barilaro announced on Monday trespassers will be hit with fines of up to $220,000 per person and $440,000 for corporations from 1 August.

"Vigilantes who are entering our farmers' property illegally are nothing short of domestic terrorists - our farmers have had a gutful," Mr Barilaro said.

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"They don't deserve, nor have time, to be dealing with illegal trespass and vile harassment from a bunch of virtue-signalling thugs."

He added further legislation is being looked at including potential jail time.

It came as federal Nationals frontbencher David Littleproud has accused the states of doing "bugger all" to stop animal activists invading farms.

The Morrison government will this week introduce tough new penalties for activists who incite destructive break-ins, including up to five years in prison.

"Sadly, our state governments have done bugger all," Mr Littleproud told ABC Radio on Monday.

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"Those that provide the information to those perpetrators are just as guilty, in terms of infringing the rights of Australian farmers, as those that walked on that farm."

The opposition supports the intention of the bill - to protect farmers from trespassers - but is worried it may have unintended consequences.

Labor's agriculture spokesman Joel Fitzgibbon is concerned the laws could affect journalists, whistleblowers and farmers opposed to issues like coal seam gas.

READ MORE Morrison wants trespass laws targeting animal activists passed within two weeks

"If Channel Nine runs a video on its website and the story somehow inadvertently incites a trespass are they exempt under this bill? They are not," he told ABC radio.

"We will allow the carriage service laws to be beefed up as long as the bill as drafted doesn't produce a number of unintended consequences and does not unnecessarily make the law more complex."

The opposition believes there is also significant overlap between the bill and existing state laws.

"This is almost entirely in the jurisdiction of the states and you see the states are beefing up their trespass laws," Mr Fitzgibbon said.