The Australian share market has suffered its worst loss in five months amid jitters on global growth and fears the US is picking a second trade war, this one with Mexico.

The benchmark S&P/ASX200 index was down 76.4 points, or 1.19 per cent, to 6,320.5 points at 1615 AEST on Monday, while the broader All Ordinaries was down 81 points, or 1.25 per cent, to 6,410.8.

It was the worst day for the ASX200 since it lost 88.6 points, or 1.57 per cent, on January 2.

The Aussie dollar is buying 69.49 US cents, from 69.14 US cents on Friday.