Queensland Deputy Premier Jackie Trad could be in danger of losing her seat of South Brisbane if Liberal National Party (LNP) voters give their second preference to the Greens, according to a Galaxy poll.

The poll in The Courier-Mail suggests Ms Trad is under growing threat from Greens candidate Amy McMahon, who could become the party's first elected state MP.

The Greens have campaigned hard against the planned Adani coal mine, an issue that has caught Ms Trad in the difficult position of having to support her Government's backing for the project while trying to respond to the anti-mining views of her electorate.

Ms Trad's primary vote is on 38 per cent — four points down from the 2015 election — with Ms McMahon and the LNP's Simon Quinn both on 29 per cent.

The LNP poll result is a three-point drop from 2015.

Officially the LNP will recommend that its voters preference the Greens last in every seat, but Ms McMahon could overtake Ms Trad if LNP supporters make an exception in South Brisbane.

The Greens are also expected to get a preference flow from independent candidates in South Brisbane.

Despite the poll, Opposition Leader Tim Nicholls said the LNP would not change its mind about preferencing Labor ahead of the Greens in the seat.

"We're not interested in those political games. What we are interested in is delivering real changes for Queenslanders," he said.

Premier Annastacia Palaszczuk said she had no doubt Ms Trad would retain the seat.

"She's focused on jobs, she's focused on health and on education … she's working incredibly hard," Ms Palaszczuk said.

"I have every faith there will be no problem with her retaining the seat."

Ashes Test attendees 'might like to pre-poll'

Meanwhile, election pre-polling also opens today in Queensland for voters who cannot make it to a polling booth on November 25.

Queensland has more than 130 pre-poll locations with the Electoral Commission Queensland (ECQ) expecting large numbers of early voters.

ECQ spokeswoman Nicole Butler said about 20 per cent of Queenslanders voted before election day at the last state poll.

"Pre-polling starts at nine o'clock today, and everyone is welcome to vote early — you don't need a special reason to do it," she said.

"The Electoral Commission understands that people have busy lives, lots of people work on weekends now and have lots of family commitments, so everyone is welcome to pre-poll."

Ms Butler said a couple of big events being held on election day would see a large number of people voting early.

"There are a couple of groups of people who might particularly enjoy pre-polling this election — anyone heading to the Ashes Test at the Gabba might like to pre-poll so they don't miss a moment of the cricket," she said.

"And also those parents who are driving down the coast on election day to pick up schoolies might like to pre-poll so they've got that out of the way."