The Queensland Government plans to take away the courts' power to determine whether some sex offenders remain behind bars indefinitely.

Attorney-General Jarrod Bleijie has introduced legislative amendments into Parliament, allowing him to recommend that serious violent offenders be kept in jail indefinitely.

"It does take it out of the court and it does put it in my jurisdiction," he said.

"We are rebalancing the scales of justice."

Premier Campbell Newman admits to reservations about the move.

"I want to stress how absolutely reluctant we are to do this," he said.

Mr Bleijie says his recommendation would then be signed-off by the Governor.

He says it will be another layer of protection for the community.

"It will be reserved for the 'worst of the worst' - it's legislation of last resort," he said.

He says cases will be reviewed annually by two psychiatrists.

"We have put an assessment process in there with two psychiatrists currently under the Criminal Law Amendment Act 1945 as well," he said.

"The fundamental difference is though if in my view this person still poses a risk to the community, then my recommendation to Executive Council will be not to release this person."

Mr Bleijie says this is the 'plan B' he previously flagged to keep notorious serial rapist Robert John Fardon in prison.

Fardon was the first person to be detained indefinitely under Queensland's Dangerous Prisoners and Sexual Offenders Act.

The 64-year-old has spent most of his adult life in prison after being convicted of numerous sexual offences against women and children.

Fardon was briefly released under a supervision order earlier this month, but he was returned to jail when Mr Bleijie lodged an appeal against the decision.

A review of Fardon's indefinite sentence was due in August in the Supreme Court in Brisbane, but was adjourned until next month.

Bleijie has 'gone too far'

Queensland Law Society president Annette Bradfield says the separation of powers principle is at risk.

"The Government is the judge, jury and executioner," she said.

Opposition Leader Annastacia Palaszczuk agrees.

"This goes further than anything the Bjelke-Petersen government did," she said.

Prominent civil libertarian Terry O'Gorman has described changes as "lunacy".

Mr O'Gorman has also been critical of tough new bikie laws, and says Mr Bleijie has gone too far.

"It just shows the mindset, the arrogance, the megalomania of this vastly inexperienced conveyancer who's now - unfortunately, for the rest of us - been thrust into the position of Attorney-General," he said.

"This man needs a lesson in law pretty quickly."

Community expectation

But child protection advocate Hetty Johnston says she will support new sex offender laws, if the courts cannot adequately protect the community.

She says she is concerned by the amount of power it gives one person, but the Attorney-General is only doing what the community expects.

"I do worry about it, but I worry more about offenders like Robert John Fardon being released back into the community," she said.

"I worry more about the women and children that he would harm than I do about his rights in this case.

"I think everyone would prefer that these decisions are made by the judiciary, but we want these decisions to be made.

"We want our children to be the highest priority for this government, for every judge sitting behind the bench.

"Unfortunately it's the civil rights of sex offenders that take precedence over the rights of the community and children to be safe."