Papua New Guinea Prime Minister James Marape will be the first Pacific leader to address Australia's parliament and is expected to laud the relationship between the two nations.
Mr Marape is in Australia for a second time in a brief period after inking a security pact and netting $200 million for policing measures in December.
He is set to receive a ceremonial welcome at Parliament House on Thursday before addressing a joint sitting of senators and MPs, and meeting with Prime Minister Anthony Albanese.
The 52-year-old leader will also deliver an address at the Australian National University and take questions from former foreign minister-turned chancellor, Julie Bishop.
Mr Marape's visit follows deadly riots in his home capital of Port Moresby and as comments about policing talks with China cause a stir.
PNG Foreign Minister Justin Tkatchenko is also in Australia and met with counterpart Penny Wong, reaffirming his nation's commitment to the security agreement.
He was resolute no security arrangement would be made with China after making headlines last week saying Port Moresby had been approached by Beijing about policing.
"I want to make this very clear, we are not pressing forward with any security pact or agreement with China and look forward to implementing the bilateral security arrangement with Australia," he told the ABC.
Foreign Minister Wong said China was a great power asserting its interests, with Australia emphasising the importance of its regional engagement with the Pacific.
"We live in a different era and we're not going back to where we were," she told reporters in Canberra.
"I know we have to work harder and that's what we will keep doing."
Mr Marape flagged his parliamentary address would cover PNG's independence from Australia nearly 50 years ago.
But his countrymen couldn't take their sovereignty for granted as "it could have been a different independence".
"There is no greater moment than this for me to go down to Australia and thank them, we were birthed from the hands of Australia as a nation," Mr Marape told reporters in Port Moresby before departing.
"Our flag was hoisted up and the Australian flag was lowered, not torn down."
Mr Marape joined Mr Albanese for an official dinner at Parliament House on Wednesday.
Dominic Giannini and Tess Ikonomou - AAP