Jacqueline Zwambila said July elections in Zimbabwe had been "stolen" by President Robert Mugabe's government and she had no intention of using her business class ticket to return home, the Canberra Times reported.
"I don't feel safe about returning to Zimbabwe at all," said Zwambila, who is aligned with Zimbabwe's opposition Movement for Democratic Change (MDC).
"Once the elections of 31 July were stolen by the current government -- which is illegitimate -- I knew that this was the end of the line," Zwambila, whose tenure as ambassador ends on Tuesday, said in a video posted on the Canberra Times website.
Zwambila said she was seeking a protection visa from Australia so she can stay on in the country along with her family once her diplomatic status expires. But it was not immediately clear whether Canberra would approve her request.
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Mugabe, Africa's oldest leader who has been in power for 33 years, began a new five-year term after winning a landslide victory in disputed elections end of July.
His rival, opposition leader Morgan Tsvangirai, described the vote as "fraudulent", citing an unusual number of voters had been turned away in urban constituencies that are considered opposition strongholds.
But the 89-year-old veteran leader dismissed the view, brusquely telling his opponents to accept defeat.
Zwambila said that when she learned about Mugabe's victory, she saw "doom, a black cloud".
"I knew then it was the end of my term," the report quoted her as saying.
She voiced fears of indefinite detention if she returned home, saying she had been threatened with arrest in Zimbabwe after a court found that she owed several hundred dollars to a tradesman. She denied the charge.