Senator Brown offered his condolences to the family of Private Nathan Bewes, the latest Australian casualty in the conflict.
He said he shared a commitment to the brave defence forces in Afghanistan but said they should be brought home.
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"It's a terrible war, these soldiers are there at the nation's behest and we think they should be brought safely back to Australia," Senator Brown told the Nine Network on Sunday.
"Because this war is not going the way it should, it was bungled from the outset by (former US) President (George W) Bush."
A growing majority of Australians thought troops should be brought home, Senator Brown said.
"We will go to the election fighting very strongly to have our troops brought safely home from Afghanistan," he said.
The Greens leader has called for a parliamentary debate on Australia's involvement in the war.
