At least four refugees in Australia's offshore Pacific camps have attempted suicide since the conservative government's shock re-election on Saturday, according to refugees, advocates and police.

Around 800 would-be refugees who tried reach Australia have been sent to live in severe conditions on the remote islands of Nauru and Papua New Guinea's Manus under a hardline policy from Canberra.

Many had prayed for a more lenient policy from Labour, who had been strongly tipped to win.

But an unexpected victory by Scott Morrison's centre-right coalition at dashed hopes and set off a wave of self-harm including several hospitalisations.

Prominent Kurdish author and asylum-seeker Behrouz Boochani tweeted from Manus: "The situation in Manus is out of control, today two more people attempted suicide."

Manus Provincial Police Commander David Yapu told AFP that he was aware of at least ten suicide attempts including four over the weekend.

"It's an issue we are faced with right now," he said.

"Over the weekend we had an attempted arson of their rooms, and right now we have some that are refusing to eat."

Australia's Department of Home Affairs did not respond to a request for comment.

The opposition Labour party had said they would be open to a New Zealand offer to resettle refugees on Manus and Nauru.

The United Nations and human rights organisations have roundly condemned the conservative government's policy.

"We have run out of vocabulary to describe the harm wrought," the United Nations High Commissioner for Refugees in Canberra said in December.

Activists said the election was a breaking point.

"It has been building for six years, but the weekend's election result has precipitated a crisis that the government cannot afford to ignore," said Ian Rintoul from the Refugee Action Coalition.

Rintoul said men fleeing violence or persecution in Sudan, Iraq and Iran had attempted to hang or set fire to themselves.

"Offshore detention is slowing strangling the life out of its victims," he added.