"I think Australians need to be for Australians, Americans need to be for Americans", she told broadcaster ABC while on a speaking tour of the country.
In her remarks, Clinton also said her opponents would say "I'm not against women" while wearing apparel that mocked her.
"And whether it's Russian Federation in a secret way interfering with our election and producing more than 3,500 ads to try to confuse our electorate, to try to damage me, or the Chinese looking to try to influence policy, we should say no".
The claims infuriated China, which has attacked local media stories about infiltration as hysteria and paranoia.
An Australian senator quit in December following questions over his relationship with a donor to the Chinese Communist Party.
She encouraged people of all political persuasions to stand up against foreign meddling.
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But Ms Clinton warns that 'It's not just happening in the United States. "This is bigger than one candidate, one election or even one country".
I think we should take Hillary Clinton's alarmist remarks about China's takeover motives with a rock of salt - especially now that US President Donald Trump has made this backward step of withdrawing his country from the Iran nuclear deal, and also threatened sanctions on countries which continue to trade with Iran.
"I am pleased to see diplomacy blossoming with Korea but I hope we all remain clear eyed about how hard these negotiations will be and how often North Korea has broken promises", she said.
I am sure Mrs Clinton would be well aware that Labour has always been less willing than National to follow America in worldwide affairs, right or wrong.
"And we should be careful not to confer too much prestige or legitimacy on Kim Jong-un without seeing concrete concessions, let alone making concessions of our own".
Former US secretary of state Hillary Clinton fears the rise of authoritarianism and illiberal democracies like Russian Federation has left the world at a unsafe crossroads.