The Queensland Government has passed 'unexplained wealth' laws to allow it to seize money from convicted criminals.

The laws will be administered by the Crime and Misconduct Commission (CMC), with the Supreme Court to force people to pay.

Criminals will now have to prove how they have legally obtained their assets, with the Government now able to seize even legally-acquired property.

The Government can take a convicted person's assets, as well as those they have given away, in the six years before they were charged with a serious offence.

The move has been criticised by lawyers for reversing the burden of proof and spreading the net beyond ill-gotten gains.

However, Attorney-General Jarrod Bleijie says it will deter would-be criminals.

"Once the unexplained wealth order is made, the onus is then on the person subject to the application to prove their wealth was legitimately obtained," he said.

"Any amount of a person's wealth or income which they cannot prove was legally acquired will become a debt payable by that person to the state."

But the Queensland State Opposition says CMC will not have enough money or staff to enforce the new organised crime laws.

Opposition spokesman Bill Byrne says the Government has not increased the CMCs resources to deal with the extra responsibilities.

"If the CMCs not adequately resourced to use these provisions, the proposed legislation may be akin to providing a high-powered weaponry without any ammunition," he said.

"For all the hyperbole of the Government about using unexplained wealth laws to combat organised crime, serious and dangerous offenders may continue to evade accountability."

However, Mr Bleijie says the CMC is likely to be restructured.