A GoFundMe for bushfire-affected koalas has become the second-largest campaign on the crowd-funding platform in Australia, after receiving more than $1 million in donations.

Port Macquarie Koala Hospital started a the page after an expected 350 koalas perished in the devastating bush fires that hit New South Wales and Queensland.

The goal was to raise $25,000 for the rescue and rehabilitation of koalas, but that number has since been dwarfed by Australians' generosity.

Since October 31st, nearly 23,000 people have donated more than $1 million.

That number makes it the largest fundraiser on the site this year and the nation's second-largest GoFundMe campaign.

All funds go towards rehabilitating and protecting the native species. Credit: Port Macquarie Koala Hospital

The koala rescue organisation says the support has been "overwhelming".

"The Port Macquarie Koala Hospital has been overwhelmed by the kindness, good wishes and support from the Australian and international community for the wildlife icon, the koala," it said in a statement on the GoFundMe page.

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Koala Conservation Australia president Sue Ashton has called the outpouring of generosity "heartwarming".

As well as nursing koalas back to health, the hospital is also distributing drinking stations around the fire-affected areas to help give dehydrated koalas a chance of surviving in the wild.

"Originally we were aiming to do 30, we have upped the number to 100 stations because we have gotten so many donations," Ashton said.

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"We are going to document all of this, so the knowledge that we gain we can share with other wildlife organisations across Australia and they can adapt it to their particular area.

"So it's good research that is actually going to come out of this terrible tragedy."

The hospital is primarily filled with volunteers so the money raised goes directly to helping the injured koalas.