Tasmanian Liberal MP Adam Brooks wants Australia's national anthem Advance Australia Fair changed.

Australia's national anthem has been a hotly debated topic for the past week after a nine-year-old Queensland schoolgirl, Harper Nielsen, was disciplined by teachers at her Brisbane school after refusing to stand or leave the assembly.

Harper was given detention for protesting against the song, which she said disregarded Aboriginal people.

During the adjournment debate in State Parliament on Wednesday night, Mr Brooks said he "agreed with the Greens for once" and personally believed the national anthem should be updated.

"I'll always respect our national flag and our national anthem, but that doesn't mean I don't have an opinion that it should be looked at — in my personal opinion, again, that is not the view of the Government," Mr Brooks said.

"I think a song like 'We Are Australian' [I Am Australian] is probably a lot truer a reflection of us as a country."

Greens congratulate Brooks' stand

The comments came after Greens MP Rosalie Woodruff used her adjournment speech to commend Harper's bravery.

"She made the point that we cannot all rejoice for we are young and free, because it's not true," Ms Woodruff said.

"She also made the point that it's not about advancing Australia fair, when Indigenous people in this country have such a low life expectancy and such poor living conditions."

The Queensland student was given a lunch-time detention for peacefully protesting against the song she said was "wrong".

"When it says 'we are young' it completely disregards the Indigenous Australians who were here before us for over 50,000 years," Harper said.

"When it was originally written, Advance Australia Fair meant advance the white people of Australia."

Ms Woodruff later congratulated Mr Brooks for making his comments.

Mr Brooks is a popular in his Braddon electorate, and is known for his regular jabs at the Greens.

He was forced to resign as mining minister in June 2016, just months into the job, after he admitted he was still using an email account for his mining company after repeatedly denying it in Parliament.

Premier Will Hodgman subsequently promised an audit of the email account, which has still not been completed.

The Government has said the audit cannot yet be completed, due to ongoing issues with Mr Brooks' divorce, despite the divorce being finalised last year.

He recently made headlines in north-west newspaper The Advocate, where he discussed losing 56 kilograms following gastric sleeve surgery.