Prime Minister Scott Morrison attended the virtual summit hosted by the Italian prime minister.

Mr Morrison urged leaders to maintain international diplomatic pressure on the Taliban to live up to commitments it had made following its takeover of Afghanistan earlier this year.

The leaders agreed to work together to avoid a humanitarian disaster in the country, with the European Union pledging more than one billion euros ($A1.57 billion) in aid packages.

A readout of the meeting said leaders were deeply concerned about the crisis unfolding in the country and emphasised continued humanitarian support.

"They demand the Taliban allow unimpeded access for aid workers, uphold human rights especially for women and girls, that it allow those who want to leave to be able to do so," the readout said.

It was revealed earlier this week at a senate inquiry that 100,000 Afghan nationals have sought humanitarian visas from Australia, with 26,000 applications in just the last seven weeks.

Australia evacuated 4100 people from Afghanistan since the Taliban takeover in August.

The G20 meeting also called on the Taliban to not allow Afghanistan to become a safe haven for terrorists.

"Several (leaders) called for a unified stance, especially on messages to the Taliban, and a number noted that to get things done they had to deal with the Taliban but that this did not constitute recognition," the readout said.

Mr Morrison said ahead of the meeting that a co-ordinated approach from leaders was needed for Afghanistan.

"I stand with G20 members in supporting international agencies delivering much needed humanitarian assistance on the ground," he said.

"Australia is committed to helping Afghanistan build a stable and secure future."

Australian Associated Press