Prince Harry has joined Prime Minister Scott Morrison in urging frontline workers to look after their mental health following an incredibly difficult year.

Australia's frontline workers have had an incredibly difficult year, battling the Black Summer bushfires and then the coronavirus pandemic.

That's prompted Prince Harry, Duke of Sussex to join Australian Prime Minister Scott Morrison in pleading for them to look after themselves.

The prime minister on Friday launched a program called Peak Fortem, which is aimed at helping them do just that.

Based on a successful UK model, the program is an online resource for first responders and their families to better work through the stress and trauma that may occur on the job.

"I'm in awe of what our first responders do every day, and I've seen firsthand that it's not without its personal costs ... the stakes are so high every single day," Mr Morrison said in a statement urging people to take advantage of the free online program.

"Your health matters. Your wellbeing matters. Your work is vital to our community, but you are more important than your work."

Peak Fortem co-founder John Bale said the role of frontline workers is confronting, dangerous and often traumatic, and has only intensified over the past year.

Speaking from personal experience, Prince Harry too urged Australian workers to treat "mental fitness" the same as "physical fitness".

"Serving in the military, I saw first-hand how critical it is to train your mind as a muscle - not only to endure challenges and stresses, but to excel, grow, and build resilience in all aspects of life," he said in a statement.

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