Australians are "sick of being lectured to by the United Nations", Prime Minister Tony Abbott has said after a report found Australia's treatment of asylum seekers breaches an international anti-torture convention.

Mr Abbott's criticism of the UN follows his attack last month of Australian Human Rights Commission President Gillian Triggs, in which he called the report she commissioned on children in detention a "political stitch-up".

The United Nations report, by the UN's special rapporteur on torture, finds Australia is violating the rights of asylum seekers on multiple fronts under the Convention Against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment.

Special rapporteur on torture Juan Mendez found the detention of children, escalating violence in offshore processing centres, and the detention and proposed deportation of two groups of Sri Lankan and Tamil asylum seekers were in breach of Australia's international obligations.

The report, which will be tabled at the UN Human Rights Council in Geneva on Monday, has been rejected outright by the government.

In extraordinary comments on Monday afternoon, Mr Abbott attacked the UN and said its representatives would "have a lot more credibility if they were to give some credit to the Australian government" for stopping boat arrivals.

"I really think Australians are sick of being lectured to by the United Nations, particularly, particularly given that we have stopped the boats, and by stopping the boats, we have ended the deaths at sea," Mr Abbott said.

"The most humanitarian, the most decent, the most compassionate thing you can do is stop these boats because hundreds, we think about 1200 in fact, drowned at sea during the flourishing of the people smuggling trade under the former government."

Mr Abbott said the best thing the government could do to "uphold the universal decencies of mankind" was to stop boat arrivals.

"And that's exactly what we've done," he said.

"I think the UN's representatives would have a lot more credibility if they were to give some credit to the Australian government for what we've been able to achieve in this area."

The comments escalate the Abbott government's assault on bodies that oversee human rights.

Last month, the government made a series of personal attacks on Professor Triggs, the President of the Australian Human Rights Commission – Australia's human rights watchdog.

Mr Abbott branded a commission report on children in detention that revealed alarmingly high rates of sexual and physical abuse a "transparent stitch-up" and Attorney-General George Brandis said he had asked Professor Triggs to resign.

Immigration Minister Peter Dutton said on Monday the government "rejects the views of the special rapporteur that the treatment of illegal maritime arrivals in detention breaches international conventions".

"Australia is meeting all its international obligations and with other regional nations provides a range of services to people who have attempted to enter Australia illegally," Mr Dutton said.

Mr Mendez says in his report that the Abbott government had failed to adequately address concerns raised under the convention about four specific incidents.

Among the concerns raised was that escalating violence on Manus Island, and the "intimidation and ill-treatment of two asylum seekers" who gave statements about last year's violent clash at the centre was in breach of the convention.

The report also finds that recent changes to the Maritime Powers Act to give the government the power to detain asylum seekers at sea and return them violated the convention.

Mr Abbott said on Monday that the needs of all asylum seekers on Manus Island "for food, for clothing, for shelter, for safety are being more than met".

"The conditions on Manus Island are reasonable under all the circumstances. All of the basic needs of the people on Manus Island are being met and, as I said, I think the UN would be much better served by giving credit to the Australian government for what has been achieved in terms of stopping the boats," Mr Abbott said.

As a result of the government's failure to "sufficiently" answer questions, Mr Mendez concludes in his report that "the government fails to fully and expeditiously cooperate" with the Human Rights Council's mandate.

He said Australia was not complying with its international legal obligations to promptly investigate and prosecute acts of torture or cruel or degrading treatment.

Labor said on Monday the Prime Minister was "absurd" for attacking a globally respected organisation for not giving more credit to his government.

"Instead of launching a cheap attack on the report's author – Tony Abbott should be providing an assurance that all the processing facilities Australia funds are run in a safe, humane and proper manner," Labor's immigration spokesman Richard Marles said.

"A critical part of that is ensuring Australian-funded facilities process people's refugee claims without delay."

Human Rights Law Centre director of legal advocacy Daniel Webb said the report made it clear Australia's policies and actions were in breach of international law.

"The government always assures the Australian people that it complies with its international human rights obligations. But here we have the United Nations once again, in very clear terms , telling the government that Australia's asylum seeker policies are in breach of international law," Mr Webb said.

"Australia signed up to the Convention Against Torture 30 years ago. We did so because as a nation we agreed with the important minimum standards of treatment it guaranteed. Yet here we are 30 years on, knowingly breaching those standards and causing serious damage to our reputation."

Human rights lawyer Greg Barns says he is working with Tasmanian independent MP Andrew Wilkie on seeking that the International Criminal Court launch an investigation into crimes against humanity by members of the Abbott government in relation to the treatment of asylum seekers.

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