At 1700 AEST on Monday, the currency was trading at 72.36 US cents, down from 73.02 cents on Friday.
The Aussie hit a low of 72.01 US cents during afternoon trade; its lowest value since April 2009.
Steep falls in global equity markets and commodity prices on fresh concerns about the impact of a slowdown in the world's second largest economy have driven the Aussie lower, Easy Forex currency dealer Andreas Tjahja says.
"The Chinese equity market is in panic mode, it is down significantly today after steep falls last week," he said.
"This is putting a lot of pressure on the Aussie dollar."
A much weaker-than-expected report on China's manufacturing sector released last week rattled investors and exacerbated worries about a slowdown in the Chinese economy.
Mr Tjahja said it had affected global confidence with the US, Australian and Chinese stocks markets falling steeply.
CURRENCY SNAPSHOT AT 1700 AEST ON MONDAY
One Australian dollar buys:
* 72.36 US cents, from 73.02 cents on Friday
* 87.55 Japanese yen, from 89.76 yen
* 63.13 euro cents, from 64.72 euro cents
* 109.65 New Zealand cents, from 110.33 NZ cents
* 46.26 British pence, from 46.49 pence
(*Currency closes taken at 1700 AEST previous local session)
Source: IRESS
