A crowd of stunned onlookers watched the enormous bird latch its talons on to the screaming boy's head during a show at Alice Springs Desert Park.
Witnesses said the bird attempted to pick him up "like a small animal".
The boy - thought to be between six and eight years old - escaped with a "superficial" gash to his face.
Christine O'Connell from Horsham in Victoria state was visiting the park with her husband on July 6 when the attack occurred.
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"A fellow who was sitting closer said the little boy kept running his zipper up and down," said O'Connell, who caught the attack on her camera.
Distracted by the noise, the eagle grabbed the boy's green hoodie and attempted to him lift away before park staff moved in.
The attack left the boy crying and bleeding, but his injuries were not severe.
A Victorian man who was in the crowd, Keenan Lucas, told the NT News the show was ended quickly after the attack.
"The bird then flew over the crowd and tried to grab on to a young boy's head. He screamed, the mother was distraught and the presenters wrapped up the show very quickly."
The park issued a statement to the media after being contacted about the event.
"On Wednesday, 6 July, an incident occurred at the Alice Springs Desert Park where an eagle made contact with an audience member," the park said in a statement.