Wikileaks founder Julian Assange is at risk of suicide if the UK High Court next month rejects his final appeal against extradition to the United States, his lawyer has warned.

International human rights lawyer Jennifer Robinson says her client is so unwell mentally that he would be unlikely to survive extradition if the High Court does not rule in his favour.

Assange remains in London's high-security Belmarsh Prison while facing extradition on charges related to the publication of thousands of diplomatic and military documents in 2010.

"As a result of the 13 years he's been effectively in prison or under house arrest or some form of restrictions on his liberty inside the Ecuadorian Embassy he is really unwell," Ms Robinson said.

Prime Minister Anthony Albanese revealed in late November that he had personally lobbied the US government to drop the charges against Assange.

Last September, a cross-party delegation of Australian politicians travelled to the US to meet with the Justice Department to call for Assange's release.

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