The announcement was made on Monday at Corowa's Rivalea abattoir by Deputy Premier John Barilaro, Minister for Agriculture Adam Marshall and member for Albury Justin Clancy.

A new offence will target "vigilantes" from August 1 who trespass on farms and hand them an immediate on-the-spot fine of $1000, with further fines of up to $220,000 per person and $440,000 for corporations.

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

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

"We are putting in place the harshest penalties in the country and sending a strong warning to those who think it's OK to illegally invade farms and harass our hard-working farmers.

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"But we aren't stopping there. We are also looking at ways we can further deter this kind of behaviour, including introducing legislation and potential gaol time for offenders."

Mr Marshall said the government was determined to clamp down on illegal farm invasions and was working on additional changes with further penalties for those committing criminal acts associated with farm trespass.

"Today we are putting these vigilantes and thugs on notice," he said.

"Your time threatening our primary producers by illegally trespassing and creating biosecurity risks is done.

"Today's announcement complements the work the Commonwealth Government is doing in targeting the online incitement of farm trespass."

Mr Clancy said through his work as a veterinarian, he appreciated the need to safeguard the biosecurity of farms.

"We also need to protect our farmers' privacy, right-to-farm and safety, hence the importance of these changes," he said.

Under the changes to the Biosecurity Regulation 2017 it will become mandatory for site visitors to comply with a Biosecurity Management Plan.

Anyone who enters a designated biosecurity area without permission and without complying with the plan's requirements may be guilty of an offence under the Biosecurity Act 2015, and subject to the new, harsher penalties.

Farmers will need to have a biosecurity plan in place and appropriate signage.

Farmers are encouraged to contact the Department of Primary Industries or their Local Land Services office for more information.

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