Among the new class will be some two dozen fresh-faced Labor MPs who will be entering the 48th parliament as it begins sitting on Tuesday, after a decisive trouncing of the coalition at the federal election in May.
"Forty-eight might not sound like a whole lot at first but consider all that Australian democracy has lived through since 1901. It has survived two world wars and a Cold War," the prime minister will say on Sunday.
"It has outlived empires. It has endured challenges, crises, disasters and pandemics. It has stood tall through the evolution of economies, communications and borders."
He will emphasise how Australia's stable democracy as a political system is to be cherished amid rising geopolitical tensions and ongoing lethal wars.
"Each of you is about to proudly take your place in this great continuum.
"It's not something we can take for granted. Around the world now, we see examples of democracy under pressure."
Labor secured 94 out of 150 seats in the House of Representatives making it the highest number of seats ever won by a single political party in an Australian election and extended its bloc in the Senate.
In his address to parliamentarians, the prime minister will note how more Australians cast their vote than at any previous election, delivering Labor a resounding majority.
"At the heart of it is the task we all share to uphold our democracy. To protect it. To strengthen it. To improve it."
