Thirty other horses have been quarantined on the property west of Cairns, which is owned by Liberal National Party candidate Michael Trout.
Queensland's chief biosecurity officer Dr Jim Thompson says the animal that died yesterday morning has tested positive to the disease.
"This afternoon we've had confirmation of our fourth hendra case in Queensland," he said.
"This case is a little bit different than the others in that it's in north Queensland, west of Cairns.
"The story is that on Sunday a horse was sick and it was visited by a vet, samples were taken, the horse was depressed, wobbly and showed neurological symptoms and the horse died yesterday morning.
"Samples were received at the Biosecurity Queensland laboratories yesterday and testing today has confirmed that it is positive for hendra virus."
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