Prime Minister Scott Morrison announced the 1 billion Aus$ (US$700 million) nine-year plan, months after narrowly avoiding the reef being placed on UNESCO's in danger list.
Morrison said that they are backing the health of the reef and the economic future of tourism operators, hospitality providers and Queensland communities that are at the heart of the reef economy.
The move comes ahead of a general election expected in May, when Morrison will have to win key Queensland seats near the reef to remain in power.
When the UN previously threatened to downgrade the reef's World Heritage listing in 2015, Australia created a Reef 2050 plan and poured billions of dollars into protection.
The measures are believed to have arrested the pace of decline, but much of the world's largest reef system has already been damaged.
A recent study found bleaching had affected 98 percent of the reef since 1998, leaving just a fraction of it untouched.
Australians are overwhelmingly in favour of action to limit climate change, having experienced a string of global warming-worsened disasters such as bushfires, droughts and floods.
A 2021 poll by Sydney's Lowy Institute found 60 percent of Australians believed "global warming is a serious and pressing problem".
Eight in 10 Australians supported a net-zero emissions target by 2050, which the government reluctantly adopted ahead of a landmark United Nations climate summit in Scotland last year.
