He had been on a motorcycle tour of the park and was transported to an airstrip by members of the group.
Queensland Ambulance Service Northwest District Superintendent Brad Hardy acknowledged the park was home to a high number of crocodiles.
"They are normally quite timid but when they are surprised they will be aggressive," he said.
Aircrew officer Greig Allan told reporters the man was lucky to have survived the terrifying attack.
"The patient told us the crocodile would have been between two and three metres long, so he's lucky to have escaped with his life," he said.
It comes just a week after a 38-year-old woman was bitten on the leg by a freshwater croc while swimming at Lake Argyle, in the remote Kimberley Region of Western Australia.