Queensland’s deputy premier should have referred corruption allegations against Clive Palmer two years ago, the state’s opposition says.

Queensland’s opposition has questioned why the deputy premier waited two years to make corruption allegations against Clive Palmer.

Labor leader Annastacia Palaszczuk has also raised concerns about whether the state government is holding other “secret” meetings behind closed doors.

“Why now? Well I think it’s quite obvious, one only needs to look at the polls,” she told reporters in Brisbane on Sunday.

“At the time Clive Palmer was a huge donor to the LNP.

“I’m very concerned about this disturbing practice of the deputy premier meeting with proponents behind closed doors secretly.”

Deputy Premier Jeff Seeney has referred Mr Palmer to the Crime and Misconduct Commission (CMC) over alleged dodgy approaches by the mining magnate to buy political support.

He alleges Mr Palmer sought special treatment for his western Queensland mining investments shortly after the LNP’s landslide victory in 2012.

Mr Seeney says police and the CMC weren’t told about the corruption allegations at the time, but Premier Campbell Newman was.

Mr Palmer believes he has done nothing wrong and says Mr Newman and Mr Seeney should have reported the allegations sooner if they were concerned.

Mr Seeney referred Mr Palmer to the CMC on Friday after airing the allegations on ABC’s 7.30 Queensland program.

He denied reading a bill concerning activity in the Galilee Basin, allegedly drafted by Mr Palmer who has significant interests in the area.

He said he didn’t read it because he rejected Mr Palmer’s approaches immediately.

The interview came after Mr Seeney intensified his attack on Mr Palmer in parliament, accusing him of buying state MPs.

Mr Newman has also accused the mining magnate of trying to buy his government, allegations which will see the pair square off in court.