Jail for youths who breach bail under tough new laws

The opposition is warning the latest move could break the state's youth justice system, which is already facing overflowing detention centres and workforce protests over unsafe environments.

The Liberal National government's latest addition to the reforms, announced on Sunday, comes with its own slogan: "breach bail, go to jail."

"We're heading in the right direction and we've heard from Queenslanders who are telling us to keep going," Mr Crisafulli said.

The adult crime, adult time laws provide for increased punishments for under-age offenders who commit one of 47 serious offences listed under the Youth Justice Act.

The bail breach changes announced at the LNP convention in Brisbane effectively create a new offence that will come with a mandatory minimum sentence.

Mr Crisafulli said that meant the jail time - to be served at a youth detention centre - would only impact repeat offenders.

"That's not bad luck, it's bad behaviour," he said.

But the state opposition said the government hadn't thought about the impact on the justice system, especially following a strike in June by staff protesting what they said were unsafe lockdowns.

"Today's announcement is another slogan without substance and it could break the Queensland youth justice system," Labor youth justice spokeswoman Di Farmer said.

"We have detention centres at capacity in almost constant lockdown, staff walked out last month because they were not feeling safe."

Lawyers, doctors, academics and agencies such as Anglicare have railed against previous adult time, adult crime changes, labelling them "shameful" and ineffective.

The laws have also been declared incompatible with the state's human rights act and the UN Convention on the Rights of the Child.

The changes were a key campaign promise ahead of the LNP's 2024 election win and have since been expanded to include more offences.