Sweeping new anti-terror laws to be introduced to Parliament on Wednesday will give ASIO the power to kill suspects.

The new legislation will give ASIO agents a licence to kill in extreme circumstances, such as self-defence or to protect the lives of others.

Attorney General George Brandis will also push for a change to the criminal code and introduce a penalty for the offence of "advocating terror".

The change will mean radical preachers who incite "hate speech" can be jailed for up to five years.

But Mr Brandis said ASIO could never be authorised to torture.

"This is not something that any Australian government agency, no matter what the circumstances, would ever do," he said.

The Australian Greens are concerned giving agencies more power will overturn democratic rights and restrict civil liberties.

Labor's legal affairs spokesman Mark Dreyfus said ASIO and the police already did "very fine work" without new laws.

A parliamentary committee wants changes made to the agency powers bill, including better oversight of provisions that give spies immunity from criminal prosecution, and the government has said it supports the committee's 17 recommendations.

ASIO and the federal police were happy with the planned changes, Mr Brandis said.